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AlgebraicAardvark

If he has $75 and need $93 to make the purchase, he needs to find the difference between what he needs and what he has:

     93 - 75 = 18

He needs to borrow $18 to make the purchase.

Answer:

Sonny needs to borrow $18.

Step-by-step explanation:

If you subtract the amount of money he needs, with the money he has, we get $18. Which means, thats the amount of money he needs left to get the purchase he wants.