There are 12 months in a year:
$1,200 monthly = $14,400 annually (1,200 x 12)
There are 26 bi-weekly pay periods in a year:
$900 biweekly = $23,400 a year (900 x 26)
There are 52 weeks in a year:
$650 weekly = $33,800 annually (650 x 52)
There are semimonthly 24 pay periods in a year:
$700 semimonthly = $16,800 per year (700 x 16,800)