Question

Explain witch situation will give you the best price : a discount of 15% and then 10% and then 15% off that amount ,or a discount of 25%

Answer 1

First one:

a discount of 15% and then 10% and then 15% off that amount

Explanation:

15% discount means 100-15 = 85% is to be paid

10% discount means 100-10 = 90% is to be paid

25% discount means 100-25 = 75% is to be paid

Let X be the cost before discount

1st offer:

85% of 90% of 85% of X

(85/100) × (90/100) × (85/100) × X

= 0.65025X

2nd offer:

75% of X

(75/100) × X

= 0.75X

Since 0.65025 < 0.75,

Offer 1 is better