To determine the regular price r of the ingredients before the discount, we have to consider that $28 represents 70% of the regular price as this amount has a 30% discount and with that, find the price that represents 100%:
$28 → 70%
r ← 100%
r=($28*100%)/70%= $40
The regular price r of the ingredients before the discount is $40.
In a geometric progression: a, b, c, d... The common ratio can be obtained using: b/a = c/b = d/c b/a = 112 / 64 = 1.75 c/b = 196 / 112 = 1.75 d/c = 343 / 196 = 1.75 The common ratio = 1.75
