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Enemy coin drop rate
NO COINS 45% chance
Small Coins (usually 1-3) 30% chance
Medium coins (usually 1-2) 20% chance
Large coins (ONLY 1) 10% chance

This is just my opinion but maybe some one can justify my statement 

-Small are worth 1 

-Medium are worth 3

-Large are worth 5

(Edited 1 time)

You're almost right. Coin values are correct but drop chance looks like table below.

Enemy coin drop rate
No coins50%
1 small coin16.75%
2 small coins13.25%
1 medium coin10%
1 medium and 1 small coin6.75%
1 large coin3.25%