10 * 155 = 1550
3 * 100 + 5 * 150 = 1050
1550 – 1050 = 500
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.155. Find the unknown rate of two towels?

[a] A) 400
[b] B) 450
[c] C) 500
[d] D) 550
[e] E) 600