$2-$Calculate the equivalent value today of a farm been paid by $3$ scheduled payment s $-$The first is $$200000$ after $3$ years from now with compound interest $8\%$ per annum $-$The second after $9$ years from now amounted $200000$ at compound interest $9\%$ per annum $-$The third after $10$ years from now amounted $170000$ at compound interest $7\%$ per annum