Question

When a number is increased by 9%, the result is 99. What is the original number to the nearest tenth?

Answer 1

Answer:

The original number is 90.8

Step-by-step explanation:

we know that

$100\%+9\%=109\%=109/100=1.09$

Let

x -----> the original number

The original number multiplied by 1.09 must be equal to 99

so

$1.09x=99$

Solve the linear equation for x

Divide by 1.09 both sides

$x=99/1.09$

$x=90.8$