Maintenance costs stuff on equipment is 20,000 pesos a year for two years, 40,000 pesos at the end of four years, and 80,000 pesos at the end of eight years compute the semiannual amount that must be...

Maintenance costs stuff on equipment is 20,000 pesos a year for two years, 40,000 pesos at the end of four years, and 80,000 pesos at the end of eight years compute the semiannual amount that must be set aside for this equipment. Money is worth 10% compounded annually.