Question

An electronic device that previously sold for $21has been reduced to 17.43 the price reduction rounded to the nearest whole percent is

17%
20%
21%
83%

Answer 1

Find the dollar amount of the price reduction: $21-17.43=r

Then determine what percent it is of the original price: r/21=p

That gives you the percent, as a decimal, so just convert it to a percent.