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To purchase $12,600 worth of lab equipment for his business, Ravi made a down payment of $ 1900 and took out a business loan for the rest. After 2 years of paying monthly payments of $474.24, he finally paid off the loan. (a) What was the total amount Ravi ended up paying for the equipment X (including the down payment and monthly payments)? (b) How much interest did Ravi pay on the loan