Can you find 100% given a percentage less than 100% and how?

Carl wants to buy a television that cost $500 including taxes. to pay for television he will use a payment plan that requires him to make a down payment of $125 and then pay $70.50 each month for six months what is the percent increase from the original cast of the television to the cost of the television using a payment plan.

Given abcd ac=38 and ae=3x+4 find the value of x

For what value of (y) is 3^3/3^y =1/9