7. Nancy Potts paid \( \$ 19,720 \) down on a house costing \( \$ 128,300 \). How much did she have to mortgage? \( \$ \)

Convert an interest rate of \( 10 \% \) p.a. compounded quarterly to an annual effectiv interest rate.

Boitumelo invests an amount of R28 000 for a period of 7 years. For the first two years the interest was \( 12 \% \) p.a. compounded semi-annually. The interest was then changed to \( 10 \% \) p.a. compounded quarterly. Determine the value of the investment after the 7 -year period.

₹ 6.050 is borrowed at \( 6.5 \% \) rate of indereat p.a. Find the inderest and the amount to be paid at the end of 3 years.

If Menciksh pays an inderest of 21 for 9 jears on a sum of \( \$ 2500 \), rate of incevest per annum.

A lawnmower was traded in for \( R 236 \) after 10 years. The depreciation was calculated at \( 9,2 \% \) p.a. on a straight-line basis. Determine the cost of the lawnmower 10 years ago.