### Discussion :: Simple Interest - General Questions (Q.No.8)

Priya said: (Feb 6, 2011) | |

How do you know when to use the right formulas? |

Thiru said: (Apr 5, 2011) | |

Hey its the formula of CP. |

Kuldeep Singh said: (Apr 18, 2011) | |

From where this 120R came. Please some one tell me. |

Mahesh Kumar Sanka said: (May 26, 2011) | |

@Kuldeep Singh (3000*r*4)/100=120R once check it out. @Thiru This is the formulae of Simple interest only (i=(p*t*r)/100). |

Vineesh said: (Sep 12, 2011) | |

@priya there is only one formula for simple interest. You can easily use it always just by interchanging terms. |

Shrikanth Duppada said: (May 3, 2013) | |

Lets assume that rate % = x. (If you have taken 5000 on 1% then S.I per year = 50 Rs (1 Rs for 100 then 50 hundreds so 50x100(5000)=50 Rs, if 50 per single year so for 2 years it would be 100)(Similarly for 3000). Then S.I on 5000 for 2 years = 100x. Then S.I on 3n000 for 4 years = 120x. From the problem 100x+120x = 2200. Then 220x = 2200. x=10. I hope this is clear. |

Saji said: (Oct 17, 2013) | |

@Srikanth, very good explanation. I expect such shortcut method from the discussion part keep doing the same. |

Arun said: (Nov 21, 2013) | |

By Using SI = (PRT/100). |

Nishant said: (Jun 22, 2014) | |

@Priya. r*5000*2/100 + r*3000*4/100 = 2200. And then take L.C.M. r*10000+r*12000 = 220000. 10000r+12000r = 220000. 22000r = 220000. r = 220000/22000. r =10. |

Priya Kuldeep said: (Oct 15, 2014) | |

@Nishant. You are doing it in a lengthy manner. |

Monica said: (Oct 25, 2015) | |

Let's solve through options, take option 10% Now, First, A to B. 10% of 5000 = 500. Time = 2 years. S.I = 500x2 = 1000.....I. Similarly, 10% of 3000 = 300. Time = 4 years. S.I = 300x4 = 1200......II Adding I and II, Total S.I = 2200 (as given in question). |

Mohit said: (Feb 11, 2016) | |

2200/200, 220 how come? |

Anand J said: (Apr 11, 2016) | |

In question A, B and C are given. I thought there were 3 members, I tried for 3 members. Then what is "A". Is A first person or sentence formation? Please explain. |

Likith said: (Aug 20, 2016) | |

Guys, it easy. 5000-B-2yrs 3000-c-4yrs. The rate of interest same(data). Finally, the lender gets total 2200 as interest. (use some logic). Assume B pays x amount of interest, It means c pays x - 2200. x =(5000 * 2 * R)/100 (B DATA). X - 2200 = (3000 * 4 * R)/100 *C DATA. SOLVE ABOVE 2 EQUATIONS, YOU Will GET 10% RATE OF INTEREST. |

Kumar said: (Nov 30, 2016) | |

5000 * 2 = 10000 3000 * 4 = 12000 ------------------------ = 22000 R%= 2200 * 100/22000 * 1 = 10. |

Anil said: (Feb 10, 2017) | |

Friends use backward method through options take 10%. 10% of 5000 is 500 (for 1 year) For 2 years 500*2 = 1000. 10% of 3000 is 300(for 1 year) For 4 years 300*4 = 1200. Add both interests 1000+1200 = 2200. |

Adil Shaikh said: (Sep 18, 2017) | |

Hi, Thanks everyone for giving such good explanation. |

K. Haritha said: (Dec 17, 2017) | |

5000*2*r/100+3000*4*r/100=2200, 100r+120r=220r, 220r=2200, 10. |

Nagesh N said: (Aug 28, 2018) | |

According to %change=(Difference/ initial value)*100. Similarly (5000-3000)=2000. ((2200-2000)/2000)*100=(200/2000)*100 = 10%. |

Francis said: (Nov 7, 2018) | |

We subtract 5000-3000=2000. We get 2000, In this shows that si 2200 from both, So 2000*10% = 200+2000 = 2200. We can understand that 10 % will be the rate of interest. |

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