Twenty Percent Off Which Price? Reading a Discount Precisely
Work through reference prices, successive discounts, and final totals without mistaking a large percentage for the cheapest offer.
· 3 min readCrispFacts · 116 articles
CrispFacts Editorial Team
CrispFacts uses a publication byline for research and software-assisted writing. Sources and limitations are identified in each article. This byline does not represent a named clinician or claim medical review.
Filter articles Categories
A ZIP File Can Be Smaller Without Being Private
Distinguish compression, archiving, and encryption, including why a smaller attachment is not automatically protected.
· 4 min readA City and Its Metro Area Can Have Very Different Populations
Match legal places, metropolitan statistical areas, and boundary dates before comparing population or economic figures.
· 4 min readThe Closing Date and Payment Due Date Do Different Jobs
Read a credit-card statement as a dated snapshot, then separate new activity, minimum payments, and grace-period conditions.
· 4 min readAn Annual Cost Divided by Twelve Is an Average, Not a Due Date
Separate monthly equivalents from actual cash timing, with an example showing why an apparently balanced budget can still run short.
· 5 min readA Five-Year Census Estimate Does Not Describe Only Its Final Year
Understand the time window and precision trade-off behind ACS one-year and five-year estimates before comparing local figures.
· 4 min readFull Wi-Fi Bars Do Not Prove the Internet Is Working
A strong wireless connection is only one part of the path to a website. Understand what the signal indicator can and cannot tell you.
· 2 min readWeather and Climate Use Different Time Windows
A cold afternoon and a long-term warming pattern can coexist. The distinction begins with the period and area being measured.
· 2 min readWatts and Kilowatt-Hours Measure Different Things
Work from a power label to accumulated energy, then compare cycling appliances, task duration, and the energy portion of a bill.
· 6 min readUnit Price and Package Price Answer Different Shopping Questions
Compare package sizes, concentrates, promotions, and usable quantities with worked examples that keep the actual checkout cost visible.
· 5 min readA Time Zone Needs a Date When Daylight Saving Is Involved
A city can change its UTC offset during the year. Use the place and meeting date instead of relying on a fixed-hour shortcut.
· 2 min readA Plastic Resin Code Does Not Promise Curbside Recycling
The number on a plastic item identifies material; local collection rules determine whether that item belongs in your recycling bin.
· 2 min readHTTPS Protects a Connection; It Does Not Endorse a Seller
Separate transport security, domain identity, seller evidence, and transaction terms before treating an encrypted shop as trustworthy.
· 4 min readAPY Includes Compounding, but It Does Not Describe Every Account Cost
Calculate a simple yield example, separate balance conditions from fees, and understand why an annualized rate is not a dollar guarantee.
· 6 min read25-Hydroxy and 1,25-Dihydroxy Vitamin D Are Not Substitute Tests
Similar vitamin D names refer to different measurements. Check the complete assay name before comparing an order or report.
· 6 min readUrinalysis and Urine Culture Answer Different Questions
Routine examination and organism growth are different ways to study urine. Understand the distinction before comparing two reports.
· 5 min readTSH and Free T4: A Signal and a Hormone
Understand why TSH and free T4 appear together on some thyroid reports and why their names cannot be used interchangeably.
· 5 min readScreening, Diagnosis, and Monitoring Describe the Purpose
The same laboratory measurement can have different roles. Identify the purpose before deciding what a result is supposed to answer.
· 7 min read