Robin's heparin has been infusing at 18/units/kg/hr (27 mL/hr) for 6 hours. Bloodwork has been drawn, and shows a PTT of

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Robin's heparin has been infusing at 18/units/kg/hr (27 mL/hr)
for 6 hours. Bloodwork has been drawn, and shows a PTT of 42
seconds. According the the protocol, You are to give her a bolus of
3900 units, and increase the infusion by 2 units/kg/hr. Robin
weighs 75 kg
a) Given heparin supply for the bolus contain 5000 units/mL, how
many mL will be needed for the bolus? Round to the hundredth of a
mL.
b) The heparin for infusion is labelled heparin 25,000 units in
500 mL D5W. What will the new infusion rate be in mL/hr?