Hi can someone help me how to avoid overlapping crystal report...

in my case i have subreport under mean report..

the mean report is general format
ex.
after the total is the percentage is the sub-report

Code:
month       writing        reading   total      percentage
January         1                1          2              20%
Febuary         2                3          5              50% 
Marh            1                2          3              30%
Total           4                6          10            100%
Percentage      40%             60%         100%