Which answer is correct for the equation 3-3 * 6 +2 = ? -13 or -17 ?
12 % = rf + -LRB- 1.2 × RP -RRB- 9 % = rf + -LRB- 0.8 × RP -RRB- . Solving these equations , we obtain rf = 3 % and RP = 7.5 % . How do I get the answers ?