Please help me to solve this question.

010. (4) What is an Indifference Curve? What are the assumptions and properties of Indifference curves? (B) The cash flow details of a public project is as follows Initial cost Rs.21000000 Annual operating cost- Rs.1600000 Worth of annual benefits Rs.5000000 Worth-of annual disbenefits- Rs.1100000 Salvage value = Rs.400000 Interest rate per year = 8% and useful lie = 30 Years Using benefit-cost ratio method (both conventional and modified), find out the economical acceptability of the publie project. Use PW,AW and FW methods to find out the equivalent worth of costs, benefits and disbenefits