What is the bulk modulus of water if an increase of pressure is 100atms changes the volume of 100litres of water by 0.5 litres ?

Q. The bulk modulus of water if its volume changes from $100$ litre to $99.5$ litre under pressure of $100atm$ is then
(Take $1atm={10}^{5}N{m}^{-2}$)

Q. Take, bulk modulus of water $B=2100MPa$.
What increase in pressure is required to decrease the volume of $200litres$ of water by $0.004$ percent?

Q. The increase in pressure required to decrease the volume of $200L$ of water by $0.004\%$ is (Bulk modulus of water is $2.1\times {10}^{9}N/m^2$)

Q. What increase in pressure is required to decrease the volume of $200litter$ of water by $0.004$%? Given bulk modulus of water is $2100MPa$

Q. Compute the bulk modulus of water from the following data: Initial volume = 100.0 litre, Pressure increase = 100.0 atm ($1atm=1.013\times {10}^{5}Pa$), Final volume = 100.5 litre. Compare the bulk modulus of water with that of air (at constant temperature). Explain in simple terms why the ratio is so large.