How many subsets can be formed of a set A={a, b}​

4

Step-by-step explanation:

(a,a),(a,b),(b,a),(b,b)

a, b

a, ba, a

a, ba, ab, a

a, ba, ab, a b, b

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.