Express the required per cent: 

$50$marks as a percentage of $125$ marks

 Find the number: 

$8\%$ of the number is $6$ .

 Find the number: 

$7\frac{1}{2}\%$ of the number is $45$ .

 Find the number: 

$4.8\%$ of the number is $36$ .

 Find the number: 

$6\frac{1}{4}\%$ of the number is $30$ .

 Find the number: 

$35\%$ of the number is $28$ .