### Home > INT2 > Chapter 1 > Lesson 1.2.3 > Problem1-54

1-54.

Read the Math Notes box in this lesson and then answer the following questions. The cost of a large flat-screen television is decreasing 20% per year.

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: $y=a·b^x$

$a=$ initial value
$b=$ multiplier
$x=$ # of years

$\614.40$

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

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

4. Write the equation of a function to model this situation.