25. You own a custom computer software business. You must invest \( \$ 3,255 \) for computer hardware, and spend \( \$ 2.90 \) to buy and package each disk. If each disk sells for \( \$ 13.75 \), write a system of equations and determine how many disks you must sell to break even. 26. The ballpark needs to make at least \( \$ 15,000 \) from ticket sales. The ticket prices are \( \$ 20 \) for

An amount of R 500 is invested at \( i \% \) per annum compound interest. After 6 years it has grown to \( \mathrm{R} 1126,10 \). Calculate the value of \( i \), round off to a whole number and give your answer as a percentage.

A car was valued at \( \$ 31,000 \) in the year 1995 . The value depreciated to \( \$ 11,000 \) by the year 2003. A) What was the annual rate of change between 1995 and 2003 ? \( r=\square \) Round the rate of decrease to 4 decimal places. B) What is the correct answer to part A written in percentage form? C) Assume that the car value continues to drop by the same percentage. What will the value be in the year 2007 ? value \( =\$ \)

A nominal interest rate of \( 7,2 \% \) per annum is quoted. The interest is compounded monthly. 8.3.1 Calculate the effective interest rate n a round off to a whole number.

7. Mohammed borrowed N2500 at \( 4 \% \) p.a. com- pound interest. He repays N600 at the end of each year. Find out during which year the debt will finish.

On September 5, Zhu Company buys merchandise on account from Gao Company. The selling price of the goods is \( ¥ 15,000 \), and the cost to Gao Company was \( ¥ 8,000 \). On September 8 , Zhu returns defective goods with a selling price of \( ¥ 2,000 \) and the fair value of \( ¥ 300 \). Record the transactions on the books of Gao Company. Sept. 5 Sept. 5