### Home > CCG > Chapter 7 > Lesson 7.2.2 > Problem7-66

7-66.

Read the Math Notes box in this lesson and then answer the following questions.

The cost of large flat-screen televisions is decreasing $20\%$ per year. Homework Help ✎

1. What is the multiplier?

Subtract the percent from $1$.

$0.8$

2. If a $50$-inch flat-screen now costs $\1200$, what will it cost in three years?

The equation for an exponential function is: $y=a·b^x$

$a=\text{initial value}\\ b=\text{multiplier}\\ x=\text{# of years}$

$\614.40$

3. At the same rate, what did it cost two years ago?

Use the same equation as (b) and do not change the multiplier.