How is total interest in fixed deposit calculated?

Apparently Prime bank calculates interest amount in days rather than months. If I have FD of 10lakhs for 10% for 6 months. The return I should get is (10%\*1000000)/2 – 5% tax = 47500 but I get slightly lower amount because its calculated in days. Sometimes its 500rs less, sometimes its 1000. Is this the same for all banks? Do you guys get exact amount return as you calculated using above formula?

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