An insurance company has three types of annuity products: indexed annuity, fixed annuity, and variable annuity. You are given: In a year, 7,000 customers purchase indexed annuity, 5,000 customers purchase the fixed annuity, and 6,000 customers purchase the variable annuity. The number of customers who purchase both indexed annuity and variable annuity only is 300 greater than the number of customers who purchase both indexed annuity and fixed annuity only. The number of customers who purchase both indexed annuity and variable annuity only is 1200 greater than the number of customers who purchase both fixed annuity and variable annuity only. One-fourth of the customers who purchase both indexed annuity and variable annuity also purchase fixed annuity. 3,800 customers purchase only the indexed annuity. Determine the number of customers who purchase more