What is common among 11, 69, and 88?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

The below mentioned letters have been placed in a order using a logic.

DEAD, BALL, FEAR, SHOP

Can you find the logic?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

When 99 is considered higher than 100?

Why is the Hole below a Lock?

What word is pronounced the same if you take away four of its five letters?