I need help with 7 Percent , Proportions and Probabilities problems.

A new economy car is being introduced which has a choice of six different options.How many versions of this car are possible?

John is one of twelve members of the Math Honor Society at his school.A delegation of four members must be chosen to represent the school in the Math Competition.

How many different delegations could be chosen that include John?

How many different delegations could be chosen that do not include John?

Consider the lettersa,b,c,d,&e.In how many different ways can three letters be selected and arranged if repetition is not allowed?

How many ways can nine different books be arranged on a shelf?

Five people will be randomly selected from a group of 15.How many combinations are possible?

What price is each store chargingon an identical item originally costing $300?

Store A is giving a straight 60% off.

Store B is giving 30% off then an additional 30% off.

Store C is giving 50% off then an additional 20% off.

The county's population is currently 222,750.This is 35% more than lived in the county in 2010.What was the population in 2010?