Answer:
$87.50
Explanation:
We can find the price by dividing 350 by 4, since 28 divided by 4 is 7.
350/4
= 87.5
So, a set of seven rocks would be $87.50
87.50
We can use ratios to solve
28 rocks 7 rocks
-------------- = ------------------
350 dollars x dollars
Using cross products
28x = 350*7
Divide each side by 38
x = 350*7/28
x =87.5
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