A company offers a series of products for sale which pay different

A company offers a series of products for sale which pay different rates of commission to the salesperson. Platinum products pay a 20 percent commission. Gold products pay a 15 percent commission. Silver products pay 10 percent and Bronze products pay 5 percent. How much would a salesperson need to sell in Platinum products in order to equal the total commissions earned from a combined sale of $1,000 in Gold products and $15,000 in Bronze products?