Contemporary Mathematics for Business & Consumers 8th Edition by Robert Brechner,Geroge Bergeman

تمرين 60

Solve the following word problems for the unknown. Round decimals to hundredths and percents to the nearest tenth when necessary.
A letter carrier can deliver mail to 112 homes per hour by walking and 168 homes per hour by driving.
a. By what percent is productivity increased by driving
b. If a new ZIP Code system improves driving productivity by 12.5%, what is the new number of homes per hour for driving