Juice packs

Mahbuba Sharmeen Preema, Penfield School, Dhaka
The other day my grandmother offered me to have a glass of mango juice. The juice was purely blended. Just as I was about to sip it in, something caught my eyes. The glass was an ordinary small sized one and it contained a whole mango which only filled one fourth of it. Now I wonder, if only a mango costs Tk. 30-35/- and if it only fills the quarter of a glass, how come our renowned juice companies sell 500 ml bottles, covering all their costs, at this cheap price? Obviously, not all the companies are here to do charity but instead to earn the maximum profit. I really don't know what is there inside the juice packs in the name of mangoes.