Write short notes on the following accounting principles with proper example: $(18)$

a$)$ Cost Principle

b$)$ Economic Entity Assumption

c$)$ Monetary Unit Assumption

d$)$ Going Concern

e$)$ Periodicity

f$)$ Revenue Recognition Principle

g$)$ Matching Concept

h$)$ Accrual Basis of Accounting

i$)$ Dual Aspect of Accounting