A man buys an article at a 20% discount on its marked price and sells it at its marked price. What is his profit percentage? MCQ with Answer and Explanation

Explanation:
Let cost be x. x * 1.1 * 1.2 * 1.15 = 30360. x * 1.518 = 30360. x = 30360 / 1.518 = 20000.

Explanation:
Let CP = x. Loss 5% => SP1 = 0.95x. If sold at gain 10%, SP2 = 1.1x. Given 1.1x - 0.95x = 100 => 0.15x = 100 => x = 100/0.15 = 666.67, not in options. Wait, recalc: Difference = 15% of CP = 100 => CP = 100/0.15 = 666.67. But options are whole. Perhaps 500? Test: 0.15*500=75 not 100. 700 gives 105, close. But exact not in options. Let's adjust: maybe the gain would have been 10% more? Actually the problem says: if sold for Rs. 100 more, he would have gained 10% instead of loss 5%. The difference in percentage points is 15%, so 15% of CP = 100 => CP = 666.67. Not an option. So this question is flawed. I'll delete and regenerate another easy question.

Explanation:
CP = 5*35 = 175, SP = 5*42 = 210, profit = 35, profit% = 35/175*100 = 20%.