Drill Problem $7-20($Static$)[$LU $7-2(2)]-$ Complete the following: AMOUNT OF INVOICE $=$ $$600,$ TERMS $=4/10,$n$/60,$ INVOICE DATE $=7/5,$ ACTUAL PARTIAL PAYMENT MADE $=$ $$400,$ DATE OF PARTIAL PAYMENT $=7/14,$ AMOUNT OF PAYMENT TO BE CREDITED $=?,$ BALANCE OUTSTANDING $=?.$