Benjamin invested the following amounts in a unit trust fund at the beginning of every year for a period of 6 years. Take note that in Year 3 he withdrew an amount from the fund rather than make an investment. At the end of the sixth year he cashed the investment in and received an amount of R65 432. Calculate the internal rate of return (IRR) that he earned on his investment.

Year 1 R10 000

Year 2 R5 200

Year 3 (R8 300)

Year 4 R14 800

Year 5 R16 900

Year 6 R2 000