What does at least and at most mean?

At least means the minimum or the lowest baseline.

For example: A candy bar costs between 1-2$  so if there is a boy asking money from his mom, he needs to ask for at least 1$

At most means the maximum amount or the highest amount or ceiling amount. 

For example: To buy a shirt online, I need at least $10 but at most, it should cost $25

20000 as first it increases by 2500 then by 5000 so next it will increase by 10000

Horatian satire is more witty and tolerant.named after the roman satirist horacegently criticizes human nature and human follyjuvenalian satire is more angry and personal, attempting to produce anger in the reader.named after roman satirist juvenalattacks human vice-indignant