note: may you please solve and explain with using formulas

(i) Given an investment of 1,000 find the accumulation after 5 years using: (a) simple discount of 8% pa (b) compound discount of 8% pa (c) compound interest of 8% pa. (ii) Given a payment of 2,000 due in 4 years' time, calculate the present value using: (a) simple interest of 3% pa (b) simple discount of 3% pa (c) compound interest of 3% pa