Defined Benefit Accounts lan, who is self-employed, contributes $4,090 a month into a defined benefit retirement account earning interest at the rate of /year compounded monthly. At the end of 25 years, his account will be worth S _ 48,000 1 + 2) - 1 300 dollars. (a) Find the differential of S. 48000 ds = 257 1 + 5 299 12 (1 + 300 + 1 dr [b) Approximately how much more (in dollars) would lan's account be worth at the end of 25 years if his account earned 4.1%/year instead of 4%/year? 4.2%/year instead of 4%/year? 4.3%/year instead of 4%/year? (Round your answers to the nearest cent.) 4. 1% $ X 4.2% 4.3% $ Need Help? Read It Watch It Submit AnswerEffect of Supply of Radios on Price The supply equation for a certain brand of radio is given as follows where x is the quantity supplied and p is the unit price in dollars. p = s(x) = 0.3vx + 12 Use differentials to approximate the change in price when the quantity supplied is increased from 16,900 units to 17,400. (Give your answer correct to the nearest cent.) 0.58 x c Need Help? Read It Watch it