Which situation requires the multiplication counting principle to examine the number of possible outcomes

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Jamie went to home depot. she bought 25 bags of soil that cost $9 per bag. she bought 15 pots at $8 each, and she bought 23 bags of pebbles at $15 each. she used a coupon that gave her $5 off for every 100 dollars she spent. how much did jame pay at the end?

Aubrey read 29 books and eli read 52 books what number is equal to the number of books aubrey read?