Israel added $120 to his savings. this added amount represents of his total savings. if s represents the total savings, which equation could be used to determine the value of s?

The correct question in the attached figure

Let
s----------> total savings

case a) Israel added $80 to his savings

we know that
80=(1/8)*s-------> multiply by 8 both sides------> s=$640

the answer case a) is
the equation is 
80=(1/8)*s

case b) Israel added $120 to his savings

we know that
120=(1/8)*s-------> multiply by 8 both sides------> s=$960

the answer case b) is
the equation is 
120=(1/8)*s

Idon’t know what the answer is i wish i could