Question 1

Step 1: Discount Rate

Accepted Answer

We\'ll use the formula: Present Value = Future Value / (1 + Discount Rate)^Year

Question 2

Step 2: Calculate the Present Value of Each Year's Savings

Accepted Answer

Year 1 : 24,655 / (1 + 0.05)^1 = 24,655 / 1.05 = 23,481.00 baht
Year 2 : 24,655 / (1 + 0.05)^2 = 24,655 / 1.1025 = 22,363.75 baht
Year 3 : 24,655 / (1 + 0.05)^3 = 24,655 / 1.157625 = 21,298.81 baht
Year 4 : 24,655 / (1 + 0.05)^4 = 24,655 / 1.21550625 = 20,284.58 baht
Year 5 : 24,655 / (1 + 0.05)^5 = 24,655 / 1.2762815625 = 19,318.65 baht

Question 3

Step 3: Calculate the Net Present Value (NPV)

Accepted Answer

NPV = (Sum of Present Values of Savings) - Initial Investment
NPV = 23,481.00 + 22,363.75 + 21,298.81 + 20,284.58 + 19,318.65 - 41,300
NPV = 106,746.79 - 41,300 = 65,452.06 baht

Question 4

Step 4 : Calculate the ROI using NPV

Accepted Answer

ROI = (NPV / Initial Investment) * 100
ROI = (65,452.06 / 41,300) * 100 = 158% (approximately)

Return on Investment (ROI)