Q:

A) 25years | B) 15years |

C) 20years | D) 22years |

Answer: A) 25years

Explanation:

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.

5
792

1
752

4
544

Q:

A) Rs.1,860 | B) Rs.1,800 |

C) Rs.1,980 | D) Rs.2,000 |

2
559

4
547

3
570

Q:

A) 40000, 20000 | B) 48000, 12000 |

C) 36000, 24000 | D) 32000, 28000 |

2
757

2
612