**Important Concepts and Formulas on Applications of Percentages**

3. To convert a fraction into a per
cent, multiply the fraction by 100.

5. To convert a decimal into a per cent,
shift the decimal point two places to the right.

6. To convert a per cent into a
fraction, divide it by 100 after removing the symbol of %.

7. Increase = Increased value – Original
value.

8. Percentage increase =
(Increase/Original value) × 100% and increased value = (100% + increase %) ×
original value.

9. Decrease = Original value – Decreased
value.

10. Percentage decrease =
(Decrease/Original value) × 100% and decreased value = (100% – decrease %) ×
original value.

11. Discount = Marked price – Selling
price.

12. Percentage discount =
(Discount/Marked price) × 100%.

13. Selling price = Marked price × (100%
– Percentage discount).
14. GST stands for Goods and Services
Tax.

15. GST = Price before GST × GST rate.

16. Price after GST = Price before GST ×
(100% + GST rate).