pls solve this difficult problem urgently dear experts:

pls solve this difficult problem urgently dear experts: alculate the rate of interest and the sum borrowed.
5. Khushnaz borrows a sum of for 2years at SI and immediately lends out this money to another
person for the Same period at the same rate. If she makes a profit of 06.80 on this transaction at
end of two years, calculate the rate of interest.