Question

When a number is increased by 7.1%, the result is 89. What is the original number to the nearest tenth?​

Answer 1

Answer:

The original number is $83.1$

Step-by-step explanation:

Let

x -----> the original number

Remember that

$100\%+7.1\%=107.1\%=107.1/100=1.071$

The increased number is equal to multiply the original number by the factor 1.071

so

$89=1.071x$

Solve for x

Divide by 1.071 both sides

$x=83.1$