Katy invests £200 000 in a savings account for 4 years. ​ The account pays compound interest at a rate of 1.5 % per annum.​

Calculate the total amount of interest Katy will get at the end of 4 years. (3 marks)​

The graph shows the distance y, in inches, a pendulum moves to the right (positive displacement) and to the left (negative displacement), for a given number of seconds x. how many seconds are required for the pendulum to move from its resting position and return? enter your answer in the box.