Senior is \frac{1}{30}
Junior is \frac{1}{20}
for a 2 year period ( senior) 2/30 >> \frac{1}{15}
for a 2 year period ( Junior) 2/20 >> \frac{1}{10}
To find Junior - senior / senior * 100
{1/10} - {1/15}/ {1/15} * 100
= 50 percent
Junior is \frac{1}{20}
for a 2 year period ( senior) 2/30 >> \frac{1}{15}
for a 2 year period ( Junior) 2/20 >> \frac{1}{10}
To find Junior - senior / senior * 100
{1/10} - {1/15}/ {1/15} * 100
= 50 percent