How would I go about solving this problem ?

Other things equal, if the Nominal interest rate rose by 2 percentage points and the ination rate rose by 2 percentage points, then lnvestment's share of long-run GDP (l/Y*) would 0 fall by 4 percentage points. 0 rise by 4 percentage points 0 not change. 0 fall, but there is not enough information here to say how much it would fall. 0 rise, but there is not enough information here to say how much it would rise