Which subnet is host 150.60.200.107 /28 in?

Use the Subnetting Secrets Chart© again.  (The mask will be 255.255.255.240.)  The chart will have to be used to represent the last octet.  Taking the 12 masked bits we have stolen we have to presume we have ticked across the first 8 bits for the third octet and have spilled over to the fourth octet and tick the last remaining 4 bits.