Proportion that didn't quite work

During the Onam celebrations in the 3rd year of college, there were several competitions among the various branches and one of them (and the most popular) was the Athapookkalam competition. So every branch tries hard to design the most flamboyant and exquisite arrangement of flowers, and our batch wanting not to be left behind starts making a big round flashy Athapookkalam (well, not me though; I was a mere spectator or rather let’s say, a member of the morale boosting committee). But midway into the making, the flowers that we procured got used up. So we collected money from among ourselves and directs Keeri to go to the city (as he was the one in the immediate vicinity who had a bike) and buy some flowers. And out of our generosity, we told Keeri he may use the remaining money after buying the flowers for filling petrol in his bike. 

After a while, Keeri comes back with just a handful of flowers much to our disappointment and anger. On closer inspection we find that his bike, which had its fuel indicator needle close to the left before he left, is now in the extreme right position. 
What we directed: Buy flowers and with the remaining money, fill petrol.
What he did: Filled petrol and with the remaining money, bought a meager quantity of flowers from the cheapest shop in town. 

Epilogue: We had human tikka masala for Onasadya. 

Happy Onam folks!!