TEACHER: Today's topic is Arithmetic Progression(AP)

THOMAS(STUDENT): Sir, you mean AP as in AP petrol?

TEACHER: Shut up, sit down!Foolish boy!
TEACHER: Now, who can give me the correct answer to this question:
If the more you buy the lesser the price, A seller sells 10 liters for N10, 100 liters for N5.
For how much would he sell ten thousand(10 000) liters ?
THOMAS(STUDENT): Haba sir, its easy, since the more the liter the less the money,at 10 000 liters the price will finally
become FREE...