Calculate weekly, fortnightly and monthly pay from a given salary.
=A1/52 (for weekly)
=A1/26 (for fortnightly)
=A1/12 (for monthly)
where A1 is the salary (per annum)

Calculate simple interest.
=A2*B2*C2 (calculate simple interest)
=A2+D2 (amount)
where A2 is the Principal
B2 is the interest rate as a percentage
C2 is the time in years

Calculate weekly wage given hours worked and hourly rate.
=B2*C2
where B2 is the hours worked and C2 is the hourly rate
