Question

last week i could by my favorite fruit for $2.40 a pound. this week it is on sale and i get a %20 discount. how much will 3 1/2 pound cost me?

Answer 1

Data:

$2.40/lb

20% discount

To find the cost of 3 1/2 lb with the discount:

1. Find the cost of 3 1/2 lb without discount:

3 and 1/2 is equal to 6/2+1/2 =7/2

`(7)/(2)\cdot2.40=8.4`

2. As 3 1/2lb cost $8.4, find the discount:

`8.4\cdot(20)/(100)=1.68`

3. Substract from the cost of 3 1/2 the discount:

`8.4-1.68=6.72`Then, the cost of 3 1/2 pounds with the 20% of discount is $6.72