See the link below.
Don't oranges contain citric acid? Get some oranges and squeeze them!
Africa
3
If 30 oranges cost $12.00, then the cost per orange is $12.00 / 30 = $0.40. For $4.00, you can buy $4.00 / $0.40 = 10 oranges. Therefore, you can purchase 10 oranges for $4.00.
The farmers market?
fruits
18
you buy an orange tree from the store
In the fruit section of your local supermarket.
Well honey, if oranges are 5 for 75p, that means each orange costs 15p. If you have £2.70 to spend, you can buy 18 oranges because 270 divided by 15 is 18. So go ahead and stock up on those oranges, just don't forget to wash your hands after peeling them!
I think oranges with thinner skins are a better buy, and are usually sweeter.
You have to buy an orange tree, grow it, and then they will be on the tree in summer, I believe.