Andy wants to buy twenty candy bars for a party.

When Andy goes to the shop, he finds that:

The regular price of a single candy bar is 79 cents.

Packs of 5 candy bar cost $3.

There is a special offer of "buy two get one free".

Question 1. find the cost of buying 20 single candy bars at the regular price.

Question 2. how much will Andy pay if he buys 20 candy bars in packs of 5?

Question 3. find the cost of buying 20 candy bars at the special price.

1. $15.80

2. $12

3. $11.06

Step-by-step explanation:

1. Buying 20 single candy bars at regular price

The regular price of one is 79 cents.

(# of bars) X (price per bar) = regular price

20 X 79 cents = 1580 cents

1580 cents = $15.80

2. Buying 20 bars in packs of 5

Each pack is $3

(# of packs) X (price per pack) = pack price

(20/5) X ($3) = pack price

4 X $3 = $12

3. Buying 20 bars at special price

For every 2 bought, 1 is free.

(Number of bars paid for) X (price per bar) = special price

(2 (20/3)) X (0.79) = special price

14 X 0.79 = $11.06

Because for every 2 bars that are paid for, 1 is free, he pays for 14 bars and he gets the 21st free.

Andy's 20 regular priced candy bars are $15.80, bars in packs are $12, and bars at the special price is $11.06.