A machine can be designed with various degrees of reliability. The cost of loss resulting from a failure is Rs 25000. At the extra costs shown below, various designs can be built to reduce the chance of failure. The higher cost designs will also create higher annual disbursements for insurance, property, taxes and certain maintenance and repair costs. The economic life is 5 years with zero salvage and the minimum required rate of return is 20%. assume required information to solve this problem if not given.

Investment for reliability,Rs	Operating disbursement per year, Rs	Reliability of the machine
0	0	0.000
5000	300	0.500
10000	600	0.700
15000	900	0.850
20000	1.200	0.940
25000	1500	0.990
30000	1800	0.995
35000	2100	0.999