Answer:
$130
Step-by-step explanation:
Make a proportion
He should make $13 for every $100 invested, and $x for $1000 invested
13/100=x/1000
To solve for x, we need to isolate the variable, x. It is being divided by 100. To reverse this, we need to multiply both sides by 1000
1000(13/100)=(x/1000)1000
The 1000s on the right will cancel, leaving us with
130=x
So, if he invests $100, he should expect to make $130
