Question 526293
80% of the cost is
.8 * 8.50 = 6.80
.
so the sales price should be the cost + required profit
8.50 + 6.80 = 15.30
.
or you could say he need to sell for 100% of cost + 80% of cost = 180% of the cost
1.8*8.50 = 15.30
.
Done.