Thus, 4/5 is the simplified fraction for 48/60 by using the GCD or HCF method. Thus, 4/5 is the simplified fraction for 48/60 by using the prime factorization method.
To write the equation you start with the 125 because it is monthly and it doesn't say how often you pay the 75 dollars so the equation would be c(f)=125x+75
