Why is it very easy to weigh a fish?

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?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

Decode below rebus
D
N
A
T
S , D

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

Solve below popular number sequence
314 159 265 358 979 323 846 ?

You can hear me, but you can't touch or see me.

What am I?

What's the best place to go shopping in the ocean?

Jenifer and Jesica are having a conversation.

Jenifer: I am definitely not over 30.
Jesica: I am 28 and you are surely 5 years older to me at least.
Jenifer: No, you are at least 29.

You are told that both of them are lying throughout in the conversation. Can you find their respective ages?