If a bank account doubles in size every 5 years, then by what percent does it grown after only 3 years ? round to the nearest tenth of a percent. hint : first write an expression that would calculate its growth rate after a single year.!

Step-by-step explanation:

Given that a bank account doubles in size every 5 years.

Let P be the principal amount and growth rate = r

Then we have Amount after 1 year =

Similarly after 5 years amount will be

.

Cancel P to get

.

Take log to get

5r = ln 2 Or r = 0.1386

=13.86% per annum

to find the percent of growth in 3 years

In three years

= 1.516P

Hence growth rate is 1.516 times in 3 years.

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you

bn,mn,n.vn.

step-by-step explanation: