Mr. williams invested $4000 in a bond with the yearly interest rate of 4% his total interest on the investment was $800 what was the length of the investment

Out of the 150 students at a summer camp, 72 signed up for canoeing. there were 23 students who signed up for trekking, and 13 of those students also signed up for canoeing. use a two-way table to organize the information and answer the following question: approximately what percentage of students signed up for neither canoeing nor trekking?