At the start of the week, you could run for 8 minutes. by the end of the week, you could run for 15 minutes. which proportion could you use to find the percent increase in your running time?
7/15=n/100
8/7=n/100
7/8=n/100
8/15=n/100

Afactory buys 10% of its components from suppliers b and the rest from supplier c. it is known that 6% of the components it buys are faulty. of the components brought from suppliers a,9% are faulty and of the components bought from suppliers b, 3% are faulty. find the percentage of components bought from supplier c that are faulty.