1) This one is a simple division = 30/12 = 10/4 = 2.5
2) In case the exact period is not given, we can be sure which month is of 30 days and which one is of 31 days so we need to assume that every month is of 30 days hence the number of month for 194 days = 194/30 = 6.46 i.e. 6 months complete and 46th part of last month i.e. 0.46*30 days = 14 days so the Answer is 6 months and 46 days
3)7% of 50000 = 50000 *7/100 = 500*7 = 3500
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