How often does a solar eclipse occur?
18 months
3 years
1 year
1 month
It has been observed that there is a chance of solar eclipse in a time span of every 18 months.
Find the interest and the amount on: (i) Rs. 750 in 3 years 4 months at 10% per annum (ii) Rs. 5000 at 8% per year from 23rd December 2011 to 29th july 2012. (iii) Rs. 2600 in 2 years 3 months at 1% per month. (iv) Rs. 2600 in 2 years 3 months at 1% per month.
The solar eclipse can be said to occur every ___ months on an average.