Type percents as decimals or with the percent sign. 20% of 80 is 0.20 * 80, or 20% * 80. Desmos access is in Desmos on the ACT.
Percent of versus percent change
“What is 15% of 60” is multiplication. Successive changes multiply the factors, in successive percent change. One-step change by hand is in percent change.
Integer remainder tools are in lcm, gcd, and mod.
The bottom line
Convert the percent, then multiply. Do not treat 20% as the number 20.
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