(Solving for n) (Related to Checkpoint 5.5 on page 175) Alena has always wanted to own a Porsche 911 R sports car. She knows that this car is available in the market for

£350,000 and sells higher than its cost value as only a limited number of models were produced. She has invested £42,000 in a fund that pays 5 percent interest per annum.

How long does she have to wait before she can get her dream car?