Q.After allowing a discount of 15% on the marked price, an article is sold for ₹850. Find its marked price.

A 15% discount means the selling price is 85% of the marked price, so recover the marked price by dividing the selling price by 0.85.

Here $SP=₹850$ after a discount of $d=15\%$ on the marked price.

Step 1 — Relate SP to MP.

Step 2 — Solve for MP.

$MP=\frac{850}{0.85}=₹1{,}000.$ …

Adding 15% of the selling price ($850+127.50=₹977.50$) is wrong, because the discount is a percentage of the marked price, not o …