Question

If 30% of a number is 120. Find 80% of it. (with solution)

Answer 1

Answer:

Step-by-step explanation:

30a/100 = 120

30a = 12000 (multiplied 120 with 100 , 100 got transposed)

a = 12000/30

a = 40

now we have a value so 80% of 40 is 320

so the answer = 320

Answer 2

Answer:

$80\%$ of a number , i.e. $80\%$ of $400$ is $320$.

Step-by-step explanation:

To find  : $80\%$ of a number .

Given : $30\%$  of a number is $120$ .

Solution :

• As per given data we know that , $30\%$  of a number is $120$ .
• A percentage is a fraction of an amount expressed as a particular number of hundredths of that amount.
• It is denoted by means % .
• Fractions can be converted into percentages and vice-versa.
• Percentages are reversible. For example, $30 \%\ of \ 40$ is the same as $40 \%\ of \ 30$ .
• Let , number be $x$ , then we write as $30\%$  of $x$ is $120$ .  
• Finding number :

       $\frac{30}{100} \times x = 120\\\\x = \frac{120\times 100}{30} \\\\x = 4\times 100\\\\x = 400$

• Now , we know that $30\%$  of $400$ is $120$ .  
• Hence , now we can find $80\%$ of $400$ .

        $\frac{80}{100} \times 400\\\\= 80\times4\\\\= 320$