A women purchased 3 towels @ Rs.100 each, 5 towels @ Rs.150 each and two towels at a certain rate which is now slipped off from his memory. But she remembers that the average price of the towels was Rs.150. Find the unknown rate of two towels? Pick one.
A) 400
B) 450
C) 500
D) 550
E) 600
10 * 150= 
<gadget id="calculator">10 * 150</gadget>
<output>1_500</output>
1500   3 * 100 + 5 * 150= 
<gadget id="calculator">3 * 100 + 5 * 150</gadget>
<output>1_050</output>
1050   1500 – 1050= 450   450
<result>B</result>
A women purchased 3 towels @ Rs.100 each, 5 towels @ Rs.150 each and two towels at a certain rate which is now slipped off from his memory. But she remembers that the average price of the towels was Rs.150. Find the unknown rate of two towels?