Exam Maths Puzzle Numerical Ability

if nP4=7920 find nC4?

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Exam Other Question

a train running at the speed of 80km/hr leaves the railway station 6hrs after a goods train leaves and overtake in 4hrs then what is speed of good train? In the state X,the sales tax on FMCG is equal to 10 percent of the amount of the purchase price above 100/-. in state Y,the sales tax on FmCG is equal to 8 percent of the entire purchase price.For what percentage price would the sales tax in both states be equal.?

a)180/-
b)200/-
c)400/-
d)500/-