Correct Answer: Option B
ধরি, ক্রয় মূল্য = x
প্রশ্ন মতে,
[(1 - 0.075)x +31] - 0.9x = 0.2*0.9x
0.925x + 31 - 0.9x = 0.18x
0.18x + 0.9x - 0.925x = 31
1.08x - 0.925x = 31
0.155x = 31
x = 31/0.155
x = 200
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