Doubt in maths urgent pls

first calculate 1+r then divide that and go with =s for n times

profit expected to next 3 years is 50000/ an discounting/present value factor/inflation rate 10% value of good will @ 2 yrs purchase pls explian with the help (1/1+r)^n this formula nd explain how to calculate (1/1+r)^n in ordinary calculator.........

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the goodwill for 2 years purchase is 173550

can u pls explain how it is

pv factor @ 10% is .9091, .8264 and .7513 for 1,2,3 years respectively. discounted profits 45455,41320 and 37565 avg these profits 41447 and 2 years purchase will be 82894

this is right answer i think so and i before said is wrong