Hema borrowed ₹ 4000 at the rate of 15 % per annum from Banu. Find the simple interest which Hema needs to pay to Banu after 5 years?

Aresearch study is done to find the average age of all u.s. factory workers. the researchers asked every factory worker in ohio what their birth year is. this research is an example of a census survey convenience sample simple random sample