250g block costs $5.90 how much would it coast in 700g?
The price of 1 gram is 5.90/250 = 0.02 0.02 * 700 = $14
[700 / 250] x 5.90 =$16.52 cost of 700 grams.
OR:
$5.90 / 250 =0.0236 cents per gram
0.0236 x 700g =$16.52 cost of 700 grams.
