Hello everyone may can give a solution for this question ?

1. A 30-year-old lecturer plans to save for retirement until he is 55 years old. He expects to enjoy the savings for 20 years, from age 56 to age 75. He plans to take out the same amount of money every year for 20 years. She plans to start saving at the end of next year. If he saves Rp. 3,00,000 per year with an interest rate of 15% per year, how much can he take out each year when he is between 56 and 75 years old? Draw a cash flow diagram.

2. Find the interest rate (i) that makes the following two cash flows equivalent!

3. A clinical laboratory plans to build an independent wastewater management plant (WWTP). For the needs of sewage distribution, two types of specifications are considered, which must be selected under the conditions: The refurbishment cost over 60 years is equal to the initial cost. The analysis period is 60 years, so compare EUAC (X) with EUAC (Y) assuming the analysis interest rate is 6% and the salvage value for pipes and equipment is zero.

Thanks