The management of a large chain of frozen yogurt stores in New England believes that t days after the end of an advertising campaign, the volume V of sales is approximated by 0.47t 70,000+70,000e At what rate (rounded to 2 decimal places) is the sales volume changing a. 2 days after the end of the advertising campaign? sales per day b. 3 days after the end of the advertising campaign? sales per day

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