Estimate the cost of the following items of equipment:
a. A packaged boiler to produce 20,000 kg/h of steam at 40 bar
b. A centrifugal compressor, driver power 75 kW
c. A plate and frame filter press, filtration area 10 m2
d. A floating roof storage tank, capacity 50,000 m3
e. A cone roof storage tank, capacity 35,000 m