I think the answer should be C.
Statement I
2 loaves of bread when bought , the price per loaf is 10% less than the price when only 1 loaf is bought.
Therefore,
(p+q)/2 = (0.90)p
p+q = 1.80p
q= (.80)p
p could be anything and q could be anything.
Insufficient.
Statement II
6 loaves are bought for $10
p + 5q = 10
p could be anything, q could be anything.
Therefore insufficient.
Combining I & II
p + 5q = 10
q= (.80)p
we can easily find the value of p from the above given equations.
Sufficient.
Hence C is the answer.
Whats the OA?
Let me know if you have any doubts.
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