A gallon of gasoline cost 30 cents in 1960 an $1.30 in 1980 percent increase in the price = ? first we have to convert cents into dollars so that both amounts have to be in same unit 30 cents = $0.3 increase in gasoline cost = $1.30 - 0.3 = $1 now for calculating percent increase divide this with the new amount and than multiply with 100 percent increase = ($1 / $1.30) x 100 = 76.92% = 77% approx. so, there is 77% increase in the price of gasoline
