Given equation is

In general solution of

is

and

So the solution of given equation is

and

Now difference between them is 30.
So we can write




On squaring both side

$ 159,744.59 will be in the account after 20 years.
Answer: Option A
<u>Step-by-step explanation:</u>
Need to find out the amount present in the account after 20 years. The formula to find out the future value is,

Here
p : amount deposit monthly =$500
r : rate of interest =
= 0.0275
n : 12(compound monthly)
t : time =20
By substituting all the given datas in the above equation, we get



3 / 8 % = ( 3 / 8 ) / 100 = ( 3 / 8 ) * ( 1 / 100 ) = 3 / 800 ;
Answer:
42 hours
Step-by-step explanation:
1 pound = 3,500
3,500 × 3 = 10,500
1 hour = 250
10,500 ÷ 250 = 42
42 hours