A certain debt will be paid in 40 installments from January 1 to December 31 of a certain year. Each of the first 20 payments is to be $410; each of the remaining payments is to be $65 more than each of the first 20 payments. What is the average (arithmetic mean) payment that will be made on the debt for the year? Pick one.
A) 442.5  B) 450  C) 465  D) 468  E) 475
Total number of installments = 40   Payment per installment for the first 20 installments = 410   Payment per installment for the remaining 20 installments = 410+65= 
<gadget id="calculator">410+65</gadget>
<output>475</output>
475   442.5verage= (20*410 + 20*475)/40= 
<gadget id="calculator">(20*410 + 20*475)/40</gadget>
<output>885/2 = around 442.5</output>
442.50   442.5nswer 442.5
<result>A</result>
A certain debt will be paid in 40 installments from January 1 to December 31 of a certain year. Each of the first 20 payments is to be $410; each of the remaining payments is to be $65 more than each of the first 20 payments. What is the average (arithmetic mean) payment that will be made on the debt for the year?