If the selling price of an article is Rs. 450, there is a loss of 10%. What is the cost price? MCQ with Answer and Explanation

Explanation:
Let Marked Price = 100. Buy price = 80. Repairs = 8. Total Cost Price = 88. Selling Price = 115. Profit = 27. Profit percentage = (27 / 88) * 100 = 30.68%.

Explanation:
Loss = 10% of 720 = 72, SP = 720 - 72 = 648.

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.