1. Examples
1. What is 20 % of 80 ?
Solution:
`20` % of `80 = 20 / 100 xx 80 = 16`.
2. 100 is what percent of 20 ?
Solution:
Let `100` is `20` % of x
`20 / 100 xx x = 100`
`=> x = 100 xx 100/20`
`=> x = 500` .
3. What percent of 20 is 80 ?
Solution:
Let x % of `20` is `80`
`=> x/100 xx 20 = 80`
`=> x = (80 xx 100 )/20`
`=> x = 400` %
4. What is the percentage increase/decrease from 20 to 80 ?
Solution:
`:.` Percentage of increase = `|20-80|/20 xx 100=60/20 xx 100=300` %
This material is intended as a summary. Use your textbook for detail explanation.
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