Question

Which number is 30% less than 80% of 100

Answer 1

Answer:

79.7

Step-by-step explanation:

• 30%=30/100=3/10
• 80% of 100=80/100×100=80
• now 80-3/10=797/10=79.7

Answer 2

Answer:

Required number is 56.

Step-by-step explanation:

Given,30% less than 80% of 100

We want to find a number which is 30% less than 80% of 100.

Let the number be x.

We know,

a% of b

$= \frac{a}{100} \\ = \frac{ab}{100}$

For example,

20% of 500

$= \frac{20}{100} \times 500 \\ = 20 \times 5 \\ = 100$

and a% less than from b

$= \frac{100 - a}{100} \times b$

For example 5% less than from 100

$= \frac{100 - 5}{100} \times 100 \\ = 100 - 5 \\ = 95$

Now here number is x.

According to question,

$100 \times \frac{80}{100} \times \frac{100 - 30}{100} = x \\ x = 100 \times \frac{80}{100} \times \frac{70}{100} \\ x = 80 \times \frac{70}{100} \\ x = 8 \times 7 \\ x = 56$

This is a problem of percentage.

Know more about percentage.

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