A sum of money is invested for 3 years at a certain rate of interest. Had the rate of interest been 1 %more it would have fetched rupees 18 more than before find the sum of the invested.

 the sum invested = $600

Step-by-step explanation:

Interest (I) = Principal (P) × rate (r) × time (t)

Original amount: I = P × r × 3

Increased by 1%: I + 18 = P × (1+ .01)r × 3

Substitute I with Prt and set the equations equal to each other to find r:

3Pr + 18 = 3.03Pr

Solve for Pr:

         18 = 0.03Pr

   ÷0.03   ÷ 0.03  

      600 = Pr  

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step-by-step explanation:

on monday rodney ate 1/4th of the sandwich = 3/12

on tuesday he ate 1/3rd of the sandwich = 4/12

therefore in total he has eaten = 3/12 + 4/12 = 7/12

thus we can say that he has eaten 7/12 of the sandwich on monday and tuesday alltogether.

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