What do we mean by ex - interest price and cum-interest price?

keep it simple and you will easily get it what the difference between those two

The difference between the two is the same as Ex and Cum dividend price

Cum interest price :

It means the interest price included in the principal amount

Ex interest price:

It means the interest price will not include in principal amount

Cum intrest price .

if the intrest accrued from the last due date of intrest to the dat of transation is included in the price quoted

Cum intrest price = payment of (principal protion  + intrest accured) 

Ex intrest Price.

f the intrest accrued from the last due date of intrest to the dat of transation is not  included in the price quoted

Cum intrest price = payment of (principal protion only )