I think the easiest way is to get a common denominator. So I will show you that way. (another way is to change it from fractions to decimals). So at first we have: 2/5 5/8 57/100 (57/100 comes from 0.57, since it is in the hundredths place you put it over 100) The Least Common Multiple between 5, 8, and 100 is 200 2/5 = 2x40 and 5x40 = 80/200 5/8 = 5x25 and 8x25 = 125/200 57/100 = 57x2 and 100x2 = 114/200
Since there is no base down payment or anything the equation i think would just be 35m = c If there was say a one time payment of $20 and then the monthly payments it would look like 20+35m=C I hope this helps :)