Shelley's pet food store sold one customer 5 peanut butter biscuits for $3. She sold another customer 7 beef treats for $4.20. Write a proportion that compares the sales of these two items, and find the cross products. The cross products are both equal to

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Step-by-step explanation:

Given that:

Customer 1:

5 peanut butter biscuit = $3

Price per product sold :

Number Sold / price

= 5/3

Customer 2:

7 beef treats for $4.20

Price per product sold :

Number Sold / price

= 7/4.20

The cross product :

5/3 = 7 / 4.20

Cross multiply

5 * 4.20 = 3 * 7

21 = 21

Cross product of both = 21