Step-by-step explanation:
1) The very first thing to do is read and write down the given data carefully.
From here we can decipher if the intersect asked her is SIMPLE INTEREST or COMPOUND INTEREST.
2) Next step is to put the given values in the appropriate formula correctly and decipher what value is needed to be found.
3) The final step is to do the neat calculations so that there is no error while doing it.
By this we can compute the desired value correctly.