All the calculations of the interest rate in 25 seconds

Technique-1: When the capital, time and interest rate values are given-
Interest or profit = (capital x time x interest) / 100
Q. What is the interest of 600 years for simple interest at 9.5% rate?
Solution: Interest or profit = (600 x 2 x 9.5) / 100 = 114 taka

Technique-2: When interest, capital, and interest rates are given -
Time = (interest x 100) / (capital rate x interest rate)
Q: At the rate of 5%, the profit of 500 takas will be 100 takas?

Solution: Time = (100 x 100) / (500 x 5) = 4 years

Technique -3: When interest rates are high and interest rates are mentioned -
Time = (multiplied by sum of sum - 1) / interest rate x 100
Q: How many years after the interest rate of 10 rupees annually, will actually double the interest?

Solution: Time = (2- 1) / 10x100 = 10 years

Technique-4: When there is a multiplication on the basis of interest and time is mentioned
Interest rate = (Number of times multiplied by sum - 1) / time x 100
Question: How much money is the simple interest rate if any
Capital interest will actually be tripled in 8 years?

Solution: Interest Rate = (3 - 1) / 8 x 100 = 25%

Technique-5: When interest rates and capital are paid
Interest rate = (interest x 100) / (real or capital x time)
Question: What is the average annual interest rate of 5 years 400 rupees will be 140 rupees?

Solution: Interest Rate = (140 x 100) / (400x5) = 7.00

Technique-6: When two real and two-time interest is paid -
Interest rate = (total interest x 100) / {(1st capital x 1st time) + (second capital x second time)}
Question: How much is the interest rate for a simple interest rate of 200 taka for a sum of 5 years and 500 rupees for every 6 years?

Solution: Interest Rate = (320 x 100) / {(200 x 5) + (500x6)} = 8

Technique-7: When interest rates, time and interest are mentioned-
Capital or real = (100 x interest) / {100 + (time x interest rate)}
Q: How much money will be made at 8% simple interest of six years - actually 1036 rupees?

Solution: Capital or real = (100 x 1036) / {100 + (6 x 48)} = 700

Technique-8: When interest, time and interest rates are mentioned
Capital = (interest x 100) / (Time x interest rate)
Q: How much money will be given at the interest rate of Tk 4 per year for the six year interest of 84 rupees?
Solution: Capital = (84 x 100) / (6x4) = 350 Taka

Technique-9: When there are two interest rates and when interest rates and returns decrease,
Actual = Decreased returns x 100 / {(1st interest - 2nd interest rate) x time}
Q: Since the interest rate decreased from 6% to 4%, one person's annual income decreased by 20 paise. Her
How much is the actual amount?
Solution: Actual = 20 x 100 / {(6 - 4) x1 = 1000 Rupees
Thanks to everyone for thanking the post for a lot of trouble. And thank you that the post was so hard to write.

If there is any mistake, you will see forgiveness.