 # Monthly Archives: August 2012

## Simple Interest

1. Determining the Interest and the Amount

The formula for determining interest is given as:
I = Prt, where
I = interest
P = principal or the borrowed amount
r = interest rate
t = time or the duration of the loan/investment

Example 1:
Mr. Paulo Roque borrowed Php2,600 from Mr. X at an interest rate of 5%, what is the interest in 3 years? How much should Mr. Paulo Roque pay at the end of 3 years?

SOLUTION:

Given:
P = Php2,600
r = 5% or 0.05 (per year)
t= 3 years
I = ?

I = Prt
I = (2,600)(0.05)(3)
I = (2,600)(0.15)
I = Php390

Then, to find the total amount to be paid at the end of 3 years, the formula for computing it is

A = P + I, where
A = sum or total amount to be paid
P = principal
I = interest

Thus,
A = P + I
A = Php2,600 + Php390
A = Php2,990

Example 2:
How much interest will be charged if Dominic Daez borrows Php15,000 for 2 years at interest rate of 9%?

SOLUTION:

Given:
P = Php15,000
r = 9% or 0.09 (per year)
t = 2 years
I = ?

I = Prt
I = (15,000)(0.09)(2)
I = (15,000)(0.18)
I = Php2,700

## Conversion Techniques 2

Karugtong na post (2/2)

5. Converting Decimal to Fraction
STEP: To convert decimal to fraction, write the given decimal number without considering or disregarding the decimal point as the numerator and the denominator is 1 with the number of zeros annexed same as the number of decimal places in the original decimal. Then reduce the fraction to its lowest term.
Example:
* 0.5 = 5/10 = 1/2
* 1.25 = 1 and 25/100 = 1 and 1/4
* 0.125 = 125/1000 = 1/8

6. Converting Decimal to Percent
STEP: To convert decimal to percent, move the decimal point two places to the right and write the percent symbol % after the number.
Example:
* 0.079 = 7.9%
* 9.158 = 915.8%
*15.72 = 1572%
* 3.5 = 350%

P.S. Masarap ang feeling na kahit hindi ka na nag-aaral may bago ka pa ring natutunan. Dapat we should not stop learning even after schooling. Read and read and you’ll live more. It’s your way to sun zone success!

## Conversion Techniques

Business mathematics – ito ang itinuturo kong subject ngayon at gusto kong magshare ng kunti sa inyo. Heto na… 🙂

1. Converting Fraction to Decimal
STEP: To convert fraction to decimals, simply divide the numerator by the denominator.
Example:
* 3/24 = 0.125
* 9/36 = 0.25
* 5/8 = 0.625

2. Converting Fraction to Percent
STEP: To convert fraction to percent, convert first the given fraction to decimal and then move the decimal point two decimal places to the right and write the symbol percent (%) after the number.
Example:
* 5/10 = 0.5 = 50%
* 36/48 = 0.75 = 75%
* 28/32 = 0.875 = 87.5%

3. Converting Percent to Fraction
STEP: To convert percent to fraction, remove the symbol % and write 100 as denominator and then reduce it to lowest term.
Example:
* 12% = 3/25
* 85% = 17/20
* 45% = 9/20

4. Converting Percent to Decimal
STEP: To convert percent to decimal, move the decimal point two places to the left and remove the percent sign %.
Example:
* 15% = 0.15
* 62.5% = 0.625
* 0.125% = 0.00125