Write an expression for 4 snacks at n pence each

The expression for the total price paid for all snacks (P pence)= 4n Pence will be; P=4n. Calculation: let the total price for the four snacks be P pence. let the four snacks be s1,s2,s3, and s4; their prices are: s1=n pence; s2= n pence; s3=n pence; s4= n pence. therefore; the total price paid for all snacks (P pence)= s1 price +s2 price +s3 price +s4 price = n+n+n+n= 4n hence; P=4n i.e. the total price paid for all snacks (P pence)= 4n Pence

I'm not sure but i think it's 1670km/h