1 Jesy invests \( £ 8000 \) for \( \boldsymbol{n} \) years in a savings account. To find the value, V, of her investment after \( \boldsymbol{n} \) years she uses the formula: \[ \mathrm{V}=8000 \times(1.025)^{n} \] (a) Write down the annual rate of interest Jesy earns. (b) Find the total amount of interest Jesy earns in three years.

laptop has a listed price of \( \$ 520.99 \) before tax. If the sales tax rate is \( 6.75 \% \), find the total cost of the laptop with sales tax included. ound your answer to the nearest cent, as necessary. \$ \( \square \)

2 Jane sells jewellery. Her weekly commission is based on a sliding scale of on the first \( \$ 2500 \) of her sales, \( 5 \% \) on the next \( \$ 5000 \) and \( 1 \% \) thereafter. She also gets a weekly retainer of \( \$ 500 \) Jane's weekly commission

camera has a listed price of \( \$ 779.98 \) before tax. If the sales tax rate is \( 9.75 \% \), find the total cost of the camera with sales tax included Round your answer to the nearest cent, as necessary. \$ \( \square \)

Find the present value of \( \$ 7,000 \) to be received in 5 years, if money may be invested at \( 7.2 \% \) with interest compounded continuously. The present value is \( \$ \square \). (Round to the nearest cent as needed.)

How much money must you invest now at \( 4.2 \% \) interest compounded continuously in order to have \( \$ 10,000 \) at the end of 4 years? You must invest \( \$ \square \). (Round to the nearest cent as needed.)