Develop a plan for repayment of a loan received on the following conditions: a) 50,000 Ls for a period of 7 years at 8% per annum, with repayment once a year; b) 100 000 Ls for a period of 10 years at 5% per annum paid once a quarter; c) 75 000 Ls for a period of 3 years at 12% per annum if paid once a month.