# Simple interest

• Dec 9th 2009, 12:40 PM
heldrida
Simple interest
Hi,
I'm trying to figure out, how to solve this problem, I'm sorry about my english, I've tryed to do my best to translate the problem properly.

Question:

Mr. A as deposited a given amount, on a anual tax of 7%. After 6 months, Mr B deposited more \$1200 then Mr A, but on an anual tax of 9%. After 18 months from the first aplication (by Mr A), Mr B recieved an interested of \$27,75 more then Mr A

Considering Simple Interest regime, determinate how much was deposited by each one

Any sugestion is appreciated! Tks!
• Dec 9th 2009, 06:26 PM
TKHunny
Quote:

Originally Posted by heldrida
Question:

Mr. A as deposited a given amount, on a anual tax of 7%. After 6 months, Mr B deposited more \$1200 then Mr A, but on an anual tax of 9%. After 18 months from the first aplication (by Mr A), Mr B recieved an interested of \$27,75 more then Mr A

Considering Simple Interest regime, determinate how much was deposited by each one

Any sugestion is appreciated! Tks!

Comprehensible translation. A little rough, but I think I get it.

A = Amount deposited by Mr. A
B = Amount deposited by Mr. B
B = A + 1200

Interest for Mr. A: IA = A * 0.07 * (18/12)

Interest for Mr. B: IB = B * 0.09 * (12/12)

IB - IA = \$27,75

Can you finish?

For your benefit, let's see if I can re-translate for you.

Mr. A deposited a given amount with an annual interest rate of 7%. After 6 months, Mr B deposited \$1200 more than Mr A, but with an anual interest rate of 9%. After 18 months from the first deposit (by Mr A), Mr B recieved interest of \$27,75 more then Mr A.

Use Simple Interest and determinate how much was deposited by each.
• Dec 9th 2009, 06:31 PM
heldrida
Thanks a lot!

I'm going review your answer and check with my own! Hopefully I can finish it, this time, let's see...
• Dec 9th 2009, 06:54 PM
heldrida
Hi again,

I've done my best on this problem, but I've still not reached the same result that I find on "solutions", that is:

A = 5.350
B = 6.550

I'm probably missing something, I dont know, its hard to learn stuff alone.

Thanks
• Dec 9th 2009, 07:49 PM
Wilmer
Quote:

Originally Posted by heldrida
A = 5.350
B = 6.550

CORRECT...if that means \$5,350 and \$6,550.

Don't forget to divide percentages by 100 when doing calculations;
as example, 7% = .07
• Dec 9th 2009, 08:11 PM
heldrida
Ah! Thanks finally solved =D