If the profit was 170 then 25 things were bought. since n is 25 you multiply it by 8 which is 200 and if you then subtract 30 the answer is 170
B. multiply 1st equation by -2, solution (2,9).<span />
To get 66% off, multiply the price by 0.66 and subtract. tax is same, 0.075 of the amount but add to the price. that's crazy they don't allow a calculator. they use a cash register to compute those numbers . good luck
