Question

A cell phone call costs $0.07 per minute for the first 25 minutes and $0.10 per minute for each additional minute.how much would a 47 minute call cost?

Answer 1

so the first 25mins is charged at $0.07 per minute so the remaining 22 minutes will be charged at $0.10
so the total cost of 47 min = $0.07(25)+$0.10(22)
= $1.75+$2.20 = $3.95

Answer 2

\[25*\frac{7}{100}+22*\frac{10}{100}=\frac{79}{20}=3.95 \]