Calculate the total amount and compound interest on rs 8,000 for a year at the rate of 9% per annum compounded half yearly.

See below in bold.

Step-by-step explanation:

Total  = A(1 + r/n)^nt   where A = initial amount , t = number of years, r = the rate (as a decimal fraction) and  n = number of payments a year. So:

Total after 1 year =  8000(1 + 0.09/2) ^ 1*2

= RS 8736.20.

Compound interest = RS 736.20

You can't solve an equation with 2 variables.

~~~but~~~

a = (14/15)(x) + 8/15

---and---

x = (1 1/14)(a) - 4/7