Calculate present worth for the following

i= 2.5/semester ,for 36 semesters, $5,000 per semester -3%/semester decrease

i= 3.4/semester ,for 36 semesters, $5,000 per semester -3%/semester decrease

i=1.2/quarter, for 32 quarters with $10,000 + 250 quarter increase at the end of quarter

i= 0.4% for 48 months with $17,000 /month +0.15% increase at the end of the month

please show all steps and preferably excel function