Question

How to find n +30% = 40

Answer 1

n + 30% =40
n + 30/100=40
100n+30/100=40
100n+30=40×100
100n=4000-30
n=3970/100
So,n=39.7
hope it helps!!!!! :)

Answer 2

$n + 30\% = 40 \\ n + \frac{30}{100} = 40 \\ \frac{n100 + 30}{100} = 40 \\ n100 + 30 = 4000 \\ n100 = 4000 - 30 \\ n100 = 3970 \\ n = \frac{3970}{100} \\ n = 39.7$