4. A number is increased by 50% and the resulting number is then decreased by 40%. The final number is
what percent of the original number?
A. 90%
B. 95%
C. 100%
D. 105%
E.120%

  A.  90%

Step-by-step explanation:

When the number is increased by 50%, it is multiplied by (1 +50%) = 1.50.

When a number is decreased by 40%, it is multiplied by (1 -40%) = 0.60.

When both factors are applied to a number, the resulting value is ...

  1.50×0.60 = 0.90 = 90%

of the original value.

the answer is 200

step-by-step explanation:

the way the question is worded, it seems to imply the $264 interest is simple interest, not compound interest.

the simple interest for 2 years is $264; the simple interest for 1 year is $132.

$132 interest on a $600 investment means an interest rate of (132/600)*100 = 22%.

the value of $200 at 22% interest compounded annually for three years is

200%281.22%29%5e3

the amount of interest is that value, minus the original $200.