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.

\( * 22 \) Un commerçant achète 80 kg de poisson à 325 Fle kilogramme. II revend le kg de poisson 450 F. mais par suite de la chaleur il doit vendre les 30 der - niers kilogrammes 110 F seulement. Calculez: a) Le prix d'achat du poisson: b) Le prix de vente total de ce poisson: c) Le bénéfice réalisé ou la perte subie.

Nidhi deposited ₹ 7,500 in a bank which pays her \( 4 \% \) interest per annul compounded annually. Find the amount and the interest received by her aft three years.

15. Salman bought 40 chairs at \( ₹ 175 \) each. He sold one-fourth of them at a loss of \( 8 \% \). At what price each must he sell the remaining chairs so as to gain \( 10 \% \) on the whole deal? 16. A shopkeeper sold two electronic gadgets for \( ₹ 44000 \) each. The shopkeeper made a

14. A laptop and a mobile phone were bought for \( ₹ 40000 \) and \( ₹ 24000 \) respectively. The shopkeeper made a profit of \( 8 \% \) on laptop and a loss of \( 12 \% \) on mobile phone. Find she loss percent on the whole transaction.

Nidhi deposited \( ₹ 7,500 \) in a bank which pays her \( 4 \% \) interest per annum compounded annually. Find the amount and the interest received by her after three years.