শূন্যস্থান পূরণ করো
For a $30\%$ profit, the selling price is \_\_\_\_% of the original cost price.
A $20\%$ loss implies a selling price that is \_\_\_\_% of the cost price.
The formula for the selling price when there is a profit is $S = C(1 + \_\_\_\_)$.
When there is a loss, the selling price formula is $S = C(1 - \_\_\_\_)$.
If a store sells a gadget for $80, originally costing $100, use $S = C(1-r)$ to find $r$ and calculate the percentage loss to be \_\_\_\_% .
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