At car dealership x, the total profit from sales increased by 10% over previous year, while the number of cars sold decreased by 10% over previous year, Approximately, what was the average % increased in profit per car over previous year? A-18%, B-20%, C-22%, D-23%, E-25%

bpgen wrote:At car dealership x, the total profit from sales increased by 10% over previous year, while the number of cars sold decreased by 10% over previous year, Approximately, what was the average % increased in profit per car over previous year? A-18%, B-20%, C-22%, D-23%, E-25% the total profit from sales previous year be x the number of cars sold previous year be s average profit per car=x/s yhis year total profit has increased 10 %=1.1x the number of car sold decreased by 10 % =0.9s average profit per car=1.1x/0.9s increase in profit =1.1x/0.9s - x/s=0.2x/s so increase in % over previous year =(0.2x/s)/(x/s) *100=20 %

total profit from sales previous year be 1000 number of cars sold previous year be 100 average profit per car=1000/100=10 this year total profit has increased 10 %=1100 number of car sold decreased by 10% =90 average profit per car=1100/90=110/9 increase in profit =110/9-10=20/9 increase in % over previous year =20/9/10=20/90=.22 =22%

amising6 wrote:bpgen wrote:At car dealership x, the total profit from sales increased by 10% over previous year, while the number of cars sold decreased by 10% over previous year, Approximately, what was the average % increased in profit per car over previous year? A-18%, B-20%, C-22%, D-23%, E-25% the total profit from sales previous year be x the number of cars sold previous year be s average profit per car=x/s yhis year total profit has increased 10 %=1.1x the number of car sold decreased by 10 % =0.9s average profit per car=1.1x/0.9s increase in profit =1.1x/0.9s - x/s=0.2x/s [its .22x/s] so increase in % over previous year =(0.22x/s)/(x/s) *100=22 %