I mainly just need 8

Can somebody me out with this question

Which of the following is the equation that says that the product of a number and ten is equal to 20 percent of that number ? a) 10n= 2.0n b) 10+n=.20n c) n+ .20n=10 d) 10n=0.20n

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?