Question

Al's Awesome Autos advertised a special sale on cars - Dealer cost plus 5%!! Jack and Margaret ought a luxury sedan for $23,727.90. What was the dealer's cost? (HINT: Using a propotion, think of the new price being 105% of the cost of the car)
Why do you need to calculate 105% of the cost

Answer 1

105/23727.90=100/x
105x=23727.90x100
105x=2372790
(105x)/105=2372790/105
x=22598

dealers cost is $22,598

the 105% is the 100% price of the car plus the 5% of that tax or whatever it is