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