A student worked for 20 days. For each of the amounts shown in the first row of the table, the second row gives the number of days that the student earned that amount. What is the total amount of money that the student earned for the 20 days?
Amounts earned per day : $96 $84 $80 $70 $48
Number of days : 4 7 4 3 2
Choose the correct choice from the following choices
A) (1) $120
B) (2) $320
C) (3) $378
D) (4) $240
E) (5) $296
4+7+4+3+2= 
<gadget id="calculator">4+7+4+3+2</gadget>
<output>20</output>
20   The series is as follows. Arrange the terms in increasing order of amounts earned and cumulatively add up the number of days of each amount.   1st to 2nd term= 48 (2 days)   3rd to 5th term = 70 (3 days)   6th to 9th term = 80 (4 days)   10th to 16th term = 84 (7 days)   17th to 20th term = 96 (4 days)   total amount earned = 48+70+80+84+96= 
<gadget id="calculator">48+70+80+84+96</gadget>
<output>378</output>
378   Pick (3) $378
<result>C</result>
A student worked for 20 days. For each of the amounts shown in the first row of the table, the second row gives the number of days that the student earned that amount. What is the total amount of money that the student earned for the 20 days?
Amounts earned per day : $96 $84 $80 $70 $48
Number of days : 4 7 4 3 2