500=400(1+r)

Solution for 500=400(1+r) equation:

500=400(1+r)

We move all terms to the left:

500-(400(1+r))=0

We add all the numbers together, and all the variables

-(400(r+1))+500=0


We calculate terms in parentheses: -(400(r+1)), so:

400(r+1)

We multiply parentheses

400r+400

Back to the equation:

-(400r+400)


We get rid of parentheses

-400r-400+500=0

We add all the numbers together, and all the variables

-400r+100=0

We move all terms containing r to the left, all other terms to the right

-400r=-100

r=-100/-400

r=1/4