Moby sold half of his toy car collection and then bought 12 more cars the next day. He now has 48 toy cars. How many toy cars did he have to start with?

72

Step-by-step explanation:

x/2+12=48

x/2=36

x=72

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the answer to your question a or b but i am pretty sure it is b. i hope this : )

step-by-step explanation:

wholesale price is the initial price before markup. retail price comes after the markup.

a price of 8 bucks that's marked up by 100%   is

formula: initial price + (percent markup in fraction/decimal)(initial price)

8+(1)(8)

8+8

16

retail price is $16.