A) 25years | B) 15years |

C) 20years | D) 22years |

Explanation:

From the information provided we know that,

Principal + 8% p.a. interest on principal for n years = 180 …….. (1)

Principal + 4% p.a. interest on principal for n years = 120 ……… (2)

Subtracting equation (2) from equation (1), we get

4% p.a. interest on principal for n years = Rs.60.

Now, we can substitute this value in equation (2),

i.e Principal + 60 = 120

= Principal = Rs.60.

We know that SI = , where p is the principal, n the number of years and r the rate percent of interest.

In equation (2), p = Rs.60, r = 4% p.a. and the simple interest = Rs.60.

Therefore, 60 =(60*n*4)/100

=> n = 100/4 = 25 years.

A) ₹ 1,740 | B) ₹ 1,760 |

C) ₹ 1,670 | D) ₹ 2,310 |

A) 4,040 | B) 4,080 |

C) 4,008 | D) 8,000 |

A) 8.69% | B) 7.69% |

C) 7.29% | D) 7.92% |

A) ₹2,750 | B) ₹1,650 |

C) ₹2,500 | D) ₹1,500 |

A) Rs. 5,937.5 | B) Rs. 5,992.5 |

C) Rs. 5,837.5 | D) Rs. 6,037.5 |