# Theme = percentage

• Jun 14th 2007, 04:45 PM
Sazza
Theme = percentage
Hey, i'm doing some stuff on percentage, and i'd just like to clarify somethings, if that's okay???:
I have to find the simple interest on: \$620 at 8.5% p.a. for 2 years. I have so far as workings is concerned: i = p*r*t/100
= 620 * 8.5 * 24/100
i can't figure out weather i multiply the rate by the time or divide it!
also: i don't have a clue how to do this, i'm not really that good at these: \$3500 at 9% p.a. for 3 years, 9 months.

and also to clarify one more thing: Steve received an extra \$36.75 in his pay packet after receiving a pay rise of 71/2%
calculate:
a) Steve's wage before his pay rise: (my workings so far) 7.5 divided by 100 (relating %, you know how the % can be a 100) * 36.75 = 2.76
b) steve's wage now--???

Thanks,
• Jun 14th 2007, 05:12 PM
OReilly
Quote:

Originally Posted by Sazza
Hey, i'm doing some stuff on percentage, and i'd just like to clarify somethings, if that's okay???:
I have to find the simple interest on: \$620 at 8.5% p.a. for 2 years. I have so far as workings is concerned: i = p*r*t/100
= 620 * 8.5 * 24/100
i can't figure out weather i multiply the rate by the time or divide it!

Why puting t=24?
Simply multiply 8.5%*2=17%.
That is 620*8.5*2/100=105.4
• Jun 14th 2007, 05:16 PM
OReilly
Quote:

Originally Posted by Sazza
also: i don't have a clue how to do this, i'm not really that good at these: \$3500 at 9% p.a. for 3 years, 9 months.

First you should calculate how much percentage is for one single month.
That is 9% / 12=0.75%.
So we can now transform 3 years and 9 months into all months which is 3*12+9=45 months totally.

Now simply do as last problem.
3500*0.75*45/100=\$1181.25
• Jun 14th 2007, 06:23 PM
Sazza
Quote:

Originally Posted by OReilly
Now simply do as last problem.
3500*0.75*45/100=\$1181.25

do you mean for the same question as you just finished explaining or for the "steve received an extra....." question???
• Jun 14th 2007, 08:55 PM
earboth
Quote:

Originally Posted by Sazza
...
and also to clarify one more thing: Steve received an extra \$36.75 in his pay packet after receiving a pay rise of 71/2%
calculate:
a) Steve's wage before his pay rise: (my workings so far) 7.5 divided by 100 (relating %, you know how the % can be a 100) * 36.75 = 2.76
b) steve's wage now--???

Hello,

to a):

You know that 7.5% are the same as \$36.75. Calculate the money related to 1%:
\$36.75 / 7.5% = \$4.9 per percent.

He has received a 100% pay. Thus he got \$4.9 * 100 = \$490

to b):
He now get an additional pay of \$36.75. Therefore his pay is now: \$490 + \$36.75 = \$526.75
• Sep 2nd 2007, 06:50 AM
asurekha1970
Quote:

Originally Posted by Sazza
Hey, i'm doing some stuff on percentage, and i'd just like to clarify somethings, if that's okay???:
I have to find the simple interest on: \$620 at 8.5% p.a. for 2 years. I have so far as workings is concerned: i = p*r*t/100
= 620 * 8.5 * 24/100
i can't figure out weather i multiply the rate by the time or divide it!
also: i don't have a clue how to do this, i'm not really that good at these: \$3500 at 9% p.a. for 3 years, 9 months.

and also to clarify one more thing: Steve received an extra \$36.75 in his pay packet after receiving a pay rise of 71/2%
calculate:
a) Steve's wage before his pay rise: (my workings so far) 7.5 divided by 100 (relating %, you know how the % can be a 100) * 36.75 = 2.76
b) steve's wage now--???

Thanks,

yes.yours is correct.620*85*24/100*10=31*17*24/10=527*245/10=12648/10=1264.8\$ is the answer.