Question 23008
1. Let "x" be the amount you are looking for.
Then x+0.23x = 76.26
     1.23x = 76.26
         x = 76.26/1.23 = 62
The amount you are looking for is 62
2. Let "x" be your "what".
Then 3.6%(x)= 162
    0.036x = 162
         x = 162/0.036= 4500
3. Formula for simple interest is A=P(1+r)^n
   A is the amount you have after some ti024me.
   P is the amount you started with.
   r is the annual rate of interest
   n is the number of years you let the money grow.
In your case A = 2P because it doubled.
EQUATION: 
      2P = P(1+0.024)^n
      2 = 1.024^n
Take the log or ln of both sides to get 
    log2 = n(log 1.024)
   n = [log 2]/[log 1.024]
   n = 29.23 years.

Cheers,
Stan H.