Find percentage ending in 0 or 5 of any number in 5 secs

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hi Friends today i gonna show you how to find any percentage ending with 5 or 0 in 5 secs

Example : 110 % of 130

1] 100 % of 130 is 130
2] 10% of 130 is 13
3] so , Answer is 143 Smile
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I can't understand... Plz can u provide another Examples....
For the student , by the student , to the student !!
145 of 20%


1] make the percentage in to friendly parts

i will make 10 + 10

10% of 145 is 14.5

and 14.5 + 14.5 = 29

so, 20 % of 145 is 29
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    Find percentage ending in 0 or 5 of any number in 5 secs