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miller_prealgebra_2e_ch1_3

66 Chapter 1 Whole Numbers Section 1.8 Mixed Applications and Computing Mean Concepts 1. Applications Involving Multiple Operations 2. Computing a Mean (Average) 1. Applications Involving Multiple Operations Sometimes more than one operation is needed to solve an application problem. Solving a Consumer Application Example 1 Jorge bought a car for $18,340. He paid $2500 down and then paid the rest in equal monthly payments over a 4-year period. Find the amount of Jorge’s monthly payment (not including interest). Solution: Familiarize and draw a picture. Given: total price: $18,340 2,500 Minus down payment Operations: 1. The amount of the loan to be paid off is equal to the original cost of the car minus the down payment.We use subtraction: $18,340 2,500 $15,840 2. This money is distributed in equal payments over a 4-year period. Because there are 12 months in 1 year, there are months in a 4-year period.To distribute $15,840 among 48 equal payments, we divide. Jorge’s monthly payments will be $330. 4 12 48 330 48 15,840 144 144 144 00 down payment: $2500 payment plan: 4 years (48 months) Find: monthly payment $18,340 Original cost of car $15,840 Amount to be paid off Divide payments over 4 years (48 months) Skill Practice 1. Danielle buys a new entertainment center with a new plasma television for $1680. She pays $300 down, and the rest is paid off in equal monthly payments for 1 year. Find Danielle’s monthly payment. Answer 1. $115 per month TIP: The solution to Example 1 can be checked by multiplication. Forty-eight payments of $330 each amount to 48($330) $15,840. This added to the down payment totals $18,340 as desired.


miller_prealgebra_2e_ch1_3
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