Answer to #1: £2.50
Sapir bought 60 bags for £3(60) = £180. Then she sells 1/2 of them, or 30 of them, for £5 each, making £150. She sells 1/3 * 60 = 20 of them for £4 each and makes £80 more. There are 10 bags remaining, and Sapir has made £50 profit. She needs to make £25 more, and has 10 more bags to sell. So she just has to sell them for £2.50 each.
Answer to #2:
24 gingerbread men is 1.5 times the given recipe to make 16 gingerbread men, so the amount of each ingredient would be 1.5 the amount in the original recipe.
270 g flour
60 g ginger
165 g butter
45 g sugar
i hope this helps! :D