# Math Help - Theme = percentage

1. ## 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, 2. 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

3. 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

4. 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??? 5. 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 6. 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.