Clara would like to save up for her Masters in 6 years time. She expects to save Rs 50 000 at the beginning of every year for the next 5 years in an account that yields 10%. At the end of year 3, her mother will retire. The latter promises to then give her 30% of her lump sum of Rs 250 000. How much does she have saved up by the end of year 5.

What is the inverse of the matrix:*

R =