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 HP 10bII+ Issue when adding percentages
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HP 10bII+ Issue when adding percentages
11062017 12:08 AM
I am studying accounting and finance and just bought this calculator which I'm still trying to figure out how to use. I was trying to work on a formula for required rate of return R=Rf+(RmRf)*B with the following values
R=4%+(8%4%)*1.5
When I do this on excel the answer I get is 10%, however the calculator does not give me the same answer. My initial inputs where as follows:
4%+(8%4%)*1.5 = 0.16 or 15.52% As I was doing the calculation I notices something
4% transforms into 0.040
+
(
8% transforms into 0.080

4% transforms into 0.0032
)
After closing parenthesis I get 0.077 which I assume is the sum of 0.040 and the result from the operation within the parenthesis.
* 1.5
= 0.16
I have tried to do this a couple different ways and doing each step separetly, but I always come to the same issue when doing the part inside the parenthesis. What am I doing wrong?
I've had the calculator for about 2 days and honestly am having a bit of a hard time working it out. Any help is appreciated.
Thanks.
Solved! Go to Solution.
11062017 02:45 AM  edited 11062017 02:58 AM
Hi
I am confused also.
4% + (8%  %4) * 1.5 in a spreadsheet gives 0.1 or 10%
=SUM(0.04 + (0.08  0.04) *1.5) 0.1
=SUM(0.44 +(0.08  0.04) *1.5) 0.5
So the sequencing is obvious.
You must have tried putting in the converted values,
IE:
(0.08  0.04) gives 0.04
( 0.08  0.04) * 1.5 to get 0.06
then add in the add 0.04 0.04+(0.08*0.04)*1.5 and gotten 0.1??
The 0.0032 is the result of 0.08 * 0.04, but why?
11062017 03:39 AM
Hi,
It has to do with the way calculators work with percentages:
Entering "x4%" means the calculator will take off 4% of the value of x from x, i.e. x0.04*x (try this on other calculators, many will do the same).
i.e. "8%4%" will result in 4% of 8% being subtracted from 8%, i.e. 0.08  0.0032 = 0.0768 (0.077 is displayed due to decimal setting).
Then 0.0768*1.5 = 0.1152. Then 0.04 + 0.1152 = 0.1552 which is displayed as 0.16 due to the display setting.
_________________________________________________________
calculator enthusiast
11062017 04:06 AM
Hi
Knowing that now.
I would still use the values 0.08  0.04 and avoid the percentages.
then the result can be converted if wanted.
Where I know what I want the answer to be, I make the formula fit that.
1st House =(A25125000)*0.02 ; then 2nd House =((A25125000)*0.05)+(125000*0.03)
Which is the stamp duty for a house and the cost when you already own a house.
The basic percentages are 2%, 5% and 3%
I wanted the answer in CURRENCY so that is what I made.
HOUSE PRICE  1st HOUSE  2nd HOUSE 
£220,000.00  £1,900.00  £8,500.00 
£230,000.00  £2,100.00  £9,000.00 
£240,000.00  £2,300.00  £9,500.00 
£250,000.00  £2,500.00  £10,000.00 
£260,000.00  £2,700.00  £10,500.00 
£270,000.00  £2,900.00  £11,000.00 
£280,000.00  £3,100.00  £11,500.00 
£290,000.00  £3,300.00  £12,000.00 
£300,000.00  £3,500.00  £12,500.00 
11062017 05:15 AM
@Clint_flick wrote:Hi
Knowing that now.
I would still use the values 0.08  0.04 and avoid the percentages.
Yes, manually converting the percentages to decimals will work, i.e. :
0.04
+
(
0.08

0.04
)
After closing parenthesis you get 0.040 which is the result from the operation within the parenthesis.
*
1.5
=
0.10 the final result
_________________________________________________________
calculator enthusiast
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