A man purchased 3 blankets @ Rs.100 each, 5 blankets @ Rs.150 each and two blankets at a certain rate which is now slipped off from his memory. But he remembers that the average price of the blankets was Rs.157. Find the unknown rate of two blankets? Select:
A) 420 B) 550 C) 490 D) 450 E) 520
10 * 157= 
<gadget id="calculator">10 * 157</gadget>
<output>1_570</output>
1570   3 * 100 + 5 * 150= 
<gadget id="calculator">3 * 100 + 5 * 150</gadget>
<output>1_050</output>
1050   1570 – 1050= 520   Answer:520
<result>E</result>
A man purchased 3 blankets @ Rs.100 each, 5 blankets @ Rs.150 each and two blankets at a certain rate which is now slipped off from his memory. But he remembers that the average price of the blankets was Rs.157. Find the unknown rate of two blankets?