This stated the us would prevent european nations from interfering with independent american countries. the us also agreed to remain neutral in wars between european nations.

The answer is the Monroe Doctrine. This Doctrine was stated by the fifth President of the United States, James Monroe, on December 2, 1823, and became the foreign policy of the nation for many years.  

The doctrine stated that:

● The efforts of European nations to colonize land in North or South America, are considered as acts of aggression, requiring U.S. intervention.

● Any interference by European nations with states of North or South America would also be perceived as acts of aggression and would call for U.S. intervention.

● The United States would not interfere with existing European colonies.

● The United States would not get involved with the internal affairs of European nations.

let cp be x

sp= 115x/100 ---(when 15%gain)

sp = 88x/100(when 12% loss

according to question

115x/100 - 88x/100 = 81

or, (115x-88x)= 8100

or, 27x = 8100

or, x= 8100/27

x = 300

hence cp is RS 300