please solve this

Consider the following neoclassical model of the economy, where the domestic interest rate "" and the world interest rate "r" are in percentage terms. Show all your work. Y = f(K,L) = KD.5LO.5 C = 10 + 0.8(Y - 1) G = 30 T = 50 / = 20 - 2r NX = 50 - 108 * = 5 K= 100 L = 64 What is the level of GDP in the closed economy? NDU In this closed economy, solve for national savings. Calculate investment and find the equilibrium real interest rate. [Hint: the interest rate should be written as a "whole number" with the percentage sign thereafter.]