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The following will be found to be excellent rules 

 for finding the interest on any principal for any number 

 ofdays. When the principal contains cents, point 

 off four places from the right of the result to express 

 the interest in dollars and cents. When the principal 

 contains dollars only,- point off two places. 



Four per Cent.— Multiply the principal by the 

 number of days to run, and divide by 90. 



F'y e ,P <:r Cent.— Multiply by number ofdays, and 

 divide by 72. * ' 



Six per Cent— Multiply by number of days, and 

 divide by 60. 



I- 5 ?™" P« Cent.— Multiply by number ofdays, and 

 divide by 52. ' 



Eight per Cent.— Multiply by number of days, and 

 divide by 45. 



Nine per Cent.— Multiply by number of days, and 

 divide by 40. 



Ten per Cent. — Multiply by number of days, and 

 divide by 36. 



Twelve per Cent.— Multiply by number ofdays, 

 and divide by 30, 



Fifteen per Cent.— Multiply by number of days, and 

 divide by 24. 



Eighteen per Cent. — Multiply by number of days, 

 and divide by 20. 



Twenty per Cent.— Multiply by number of days, 

 and divide by 18. 



Twenty-four per Cent.— Multiply by number of days, 

 and divide by 15. 



«-S — — . _^_.| 



