The value of a computer is decreasing at a rate that is proportional at any time to the value of the computer
at that time.
The computer is worth $850 initially, and it is worth $306 after 2 years.
How much will the computer be worth after 5 years?
A. $0
B. $66
C. $79

Step-by-step explanation:

The price of computer  = 850

The price of computer after 2 years = 306

By compound depreciation,

    ... (i)

where Pn = 306

P = 850

R = rate of interest to be calculated

T = 2( number of years)

substituting the values in equation (1), we get

0.6 = 1 -

R = 40%

The worth after 5 years =

Pn = 850 (0.077)

= $66.096 = $ 66

The computer be worth after 5 years = $ 66 (option B)

there are 4 1/4 hours per 1 hour

 so 1/6 x 4 = 4/6 which reduces to  2/3