Final answer:
Betsie should buy the envelopes from Letters2go because they are cheaper per envelope compared to Value World.
Step-by-step explanation:
To find out which shop Betsie should buy the 250 envelopes from, we need to compare the prices and quantities of the envelopes in both shops.
In Letters2go, a pack of 25 envelopes costs £3.19. To find the price per envelope, we divide the total cost by the number of envelopes in the pack: £3.19 ÷ 25 = £0.1276 per envelope.
In Value World, a pack of 10 envelopes costs £1.99 and when you buy 2 packs, you get 1 pack free. This means that for every 3 packs of envelopes, you pay for 2 packs. To find the price per envelope, we divide the total cost by the number of envelopes in the 2 packs you have to pay for: (£1.99 × 2) ÷ 20 = £0.199 per envelope.
Comparing the prices per envelope, it is clear that Betsie should buy the envelopes from Letters2go because they are cheaper at £0.1276 per envelope compared to £0.199 per envelope at Value World.