Please show all work and do not use excel. Quick response = thumbs up.

1. Suppose that the accumulation function is given by a(t)=kt2+1. Further assume that $100 invested at time t=0 accumulates to $280 by time t=6. Find the present value at time t=5 of $5000 invested at time t=20. 1. Suppose that the accumulation function is given by a(t)=kt2+1. Further assume that $100 invested at time t=0 accumulates to $280 by time t=6. Find the present value at time t=5 of $5000 invested at time t=20