The daily production cost (in lakh) of manufacturing an electric device is p(x) = 7400- 60x+15x^2p(x)=7400-60x+15x 2, where xx is the number of electric devices produced per day and the daily transportation cost (in lakh) of xx number of electric devices is given by the slope of the function p(x)p(x) at point xx. Question: If the production cost on a particular day is 7475 (in lakh ), then find the number of electric devices produced on that day.