Solving the following mathematical problems:

A man's salary in 2014 was 20 thousand Taka per month and it is increased by 10% each year. Find how much he earned in the years 2015 to 2017 inclusive.

Created: 4 weeks ago | Updated: 3 weeks ago

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His salary in 2014 was 20,000 Tk. per month.

His salary in 2015 was = $(20000 + 20000 \times \frac{10}{100}) = 22, 000$ Tk. per month
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His total income in 2015 was = $22, 000 \times 12 = 2, 64, 000$ Tk.

Again, his salary in 2016 was = $22000 + 22000 \times \frac{10}{100} = 24, 200$ Tk. per month

His total income in 2016 was = $24, 200 \times 12 = 2, 90, 400$ Tk.

And, his salary in 2017 was = $(24200 + 24200 \times \frac{10}{100}) = 26, 620$ Tk. per month

His total income in 2017 was = $26, 620 \times 12 = 3, 19, 440$ Tk.

His total income from 2015 to 2017 was = $2, 64, 000 + 2, 90, 400 + 3, 19, 440 = 8, 73, 840$ Tk.

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Mr. Hossain invested m taka in a mutual fund which pays 10% interest and n taka in a privet company which pays 9% interest. He invested Tk. 18,000 and required that he receives tk 1,700 as interest. How much did he invest in each company?