ADVANCE TAX ACCRUAL INTEREST KVP INVESTMENT

Please provide me ACCRUAL INTEREST CHART (either CHART TABLE or EXCEL calculator ) fot investment made in KVP for 204 MONTHS @ 6.9% COMPOUNDED ANNUALLY -DOUBLE THE INVESTMENT IN 10y 4Months

If investment is made during the middle of the Finanacial Year , Pleae provide me downloadable EXCEL INTEREST CALCULATOR to get Finanacial Yearwise ACCRUAL  interest on account of Investment made in KVP @ 6.9% annual compounding