Carcass wrote:
Suppose you have two coupons for a certain store. One gives you 20% off any purchase; the other gives you $20 off any purchase of $60 or more. For which of the following purchase amounts (at that store) would you save more money with the 20% off coupon than with the $20 off coupon?
Indicate all that apply
$50
$60
$80
$100
$120
Let the coupons be C1 and C2 and saved amount be S1 and S2
C1 = 0.8(cost price)
S1 = 0.2(cost price)
C2 = cost price - $20
S2 = $20 (for products valued $60 or more)
Let us check the option choices;
A. $50S1 = $10
S2 = $0 (as C2 is only valid if the cost price is greater than equal to $60)
S1 > S2
B. $60S1 = $12
S2 = $20
S1 < S2
C. $80S1 = $16
S2 = $20
S1 < S2
D. $100S1 = $20
S2 = $20
S1 = S2
E. $120S1 = $24
S2 = $20
S1 > S2
Hence, option A and E