Answer:
Increase in her mass = 3.472 kg
Her new mass = 46.872 kg
Explanation:
Her original mass = 43.4 kg 
Percentage increase in her mass = 8%
Increase in her mass = 8% of 43.4 kg 
= 8/100 * 43.4 kg
= 0.08 * 43.4 kg
= 3.472 kg
Increase in her mass = 3.472 kg
b) Work out her new mass
Her new mass = Her original mass + Increase in her mass 
= 43.4 kg + 3.472 kg
= 46.872 kg
Her new mass = 46.872 kg