Profit = 0.2 CP
Profit = SP - CP
1.2CP = SP
Hence, CP = (SP/1.2) = 75.6/1.2 = 63
Now, let the cost of type 1 rice is T1 and cost of type 2 be T2.
63 = $\frac{T1 + 3T2}{4}$
= (75 + 3*x)/4
x = 59
Therefore, cost of type 2 price is 59.