Answer: 3.67 years
Explanation:
Cashflow by year
Year 0 $90,000(Investment)
Year 1 $30,000
Year 2 $35,000
Year 3 $30,000
Year 4 $25,000
Year 5 $20,000
Rate of return(ror) = 10%= 0.1
Calculating Net present value(NPV) using discount factor ;
Discount factor = 1/(1 + ror)^t
YEAR 1
Discount factor:
1/(1 + 0.1) = 1/1.1 =0.9
NPV = 0.9 × $30,000 = $27,000
YEAR 2
Discount factor:
1/(1 + 0.1)^2 = 1/1.1^2 =0.83
NPV = 0.826 × $35,000 = $29,050
YEAR 3
Discount factor:
1/(1 + 0.1)^3 = 1/1.1^3 =0.75
NPV = 0.75 × $30,000 = $22,500
YEAR 4
Discount factor:
1/(1 + 0.1)^4 = 1/1.1^4 =0.68
NPV = 0.68 × $25,000 = $17,000
YEAR 5
Discount factor:
1/(1 + 0.1)^5 = 1/1.1^5 =0.62
NPV = 0.62 × $20,000 = $12,400
Year 1: $90,000 - $27,000 = $63,000
Year 2: $63,000 - $29,050 = $33,950
Year 3: $33,950 - $22,500 = $11,450
Year 4: $17,000
Year 5: $12,400
3 years + ($11,450/$17000)
3 years + 0.67years
3.67 years.