Given Cost and Revenue functions C(q) =q-8q +599 +5000 and R(q) = -3q +2600q, what cost is incurred when marginal profit is $0? The costs are $ (Round to nearest cent.)

Given Cost and Revenue functions C(q)=q38q2+59q+5000 and R(q)=3q2+2600q, what cost is incurred when marginal profit is 50 ? The costs are $ (Round to nearest cent.)