1. | In what time will 1,860 amount to 2,641.20 at simple interest 12% per annum ? | |
2. | A sum of money at simple interest amounts to 1,012 in 2 and 1/2 years and to 1,067.20 in 4 years. The rate of interest per annum is ? | |
3. | What sum of money must be given as simple interest for six months at 4% per annum in order to earn 150 interest ? | |