Calculation confusion for 234c interest

Period of  Amount on which

Rate of Interest

Period of Interest

 Amount on which interest is calculated

If Advance Tax paid on or before June 15 is less than 15% of the Amount*       

Simple interest @ 1% per month

3 months

15% of Amount* less tax already deposited before June 15

If Advance Tax paid on or before September 15 is less than 45% of the Amount*

 Simple interest @ 1% per month

3 months

45% of Amount* less tax already deposited before September 15

If Advance Tax paid on or before December 15 is less than 75% of the Amount*

 Simple interest @ 1% per month

3 months

75% of Amount* less tax already deposited before December 15

If Advance Tax paid on or before March 15 is less than 100% of the Amount*         

Simple interest @ 1% per month

3 months

100% of Amount* less tax already deposited before March 15