Answer:
If they buy 6 cheese pizzas, they buy 2 pepperoni pizzas.
For every 3 cheese pizzas, they bought 1 pepperoni pizza.
If they buy 6 cheese pizzas:
3 * ? = 6
Rearrange to find ?
6 / 3 = ? = 2
You multiply both sides by the same number.
1 * 2 = 2
If they buy 6 cheese pizzas, they buy 2 pepperoni pizzas.
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To find the answer, we will have to find the percentage of $273 to $ 3500, and we can use the formula:

In this case:
273/3500 x 100%
=39/500 x 100%
=7.8%
Therefore the annual interest rate would be 7.8%.
Hope it helps!