Simple interest on Rs 3500 at 10% per annum for a certain period is Rs 400 more than the interest on Rs 2500 at 10% peo annum for the same same period. find the time ​

Aresearcher believes increased perceived control influence the well-being of residents at a nursing home. to test this , she allowed one group of residents to have control over their daily lies, (where to eat etc) . the other group of 5 residents had these deceisions made by staff. the resident's feelings of well-being were measured on a 10 point scale at the end of a one month trial period. is there a difference on well-being?