find Taylor's exponent and constant, optimum cutting speed

Question

Tool life in drilling steel using HSS drill is expressed at T^0.2 = 9.8 D^0.4 / V s^0/5 where D is the drill diameter (in mm), T is the tool life (in minutes), v is the cutting speed (in m/min) and s is the feed (mm/rev). the feed is set at maximum possible value of 0.4 mm/rev for given drill diameter of 30mm. the length of drilling is 50mm. the machine hour rate Rs 60 and the cost of drill is Rs. 400

i) For the given conditions, the tailor’s exponent and constant are ………

ii) The optimum cutting speed, V_opt, neglecting the work-piece and tool changing times is