Answer: $110
Explanation:
Given : A pair of Basketball shoes was originally priced at $80.
i.e. Original price of Basketball shoes = $80
Also , he marked up 37.5%.= 0.375 [∵ To convert percent to decimal we divide it by 100.]
Now the Mark up price = Markup percent x Original price

Now, the Retail price = Original price 9 Mark up price
= $80+$30=$110
Therefore , the retail price of the shoes =$110