Just give me answers to ?. make sure ITS CORRECT or I thumbs down and report

Pierce Manufacturing determines that the daily revenue, in dollars, from the sale of x lawn chairs is R(x) = 0.007x3 +0.02x2 +0.4%. Currently, Pierce sells 80 lawn chairs daily. a) What is the current daily revenue? b) How much would revenue increase if 82 lawn chairs were sold each day? c) What is the marginal revenue when 80 lawn chairs are sold daily? d) Use the answer from part (c) to estimate R(81), R(82), and R(83). a) The current revenue is $: ? b) The revenue would increase by $. ? (Round to the nearest cent.) c) The marginal revenue is $ ? when 80 lawn chairs are sold daily. d) R(81) S ? R(82) $. ? R(83)