If this is solar powered, why does it need a battery?

It lasts for years. The solar is working but at night there is no solar so it uses the battery. I was not able to open one of these to replace the battery but it lasted maybe 10 years. This is a good product.

Does this have a "kickstand" to elevate the display?

Yes. It is about a 1/2" when in place.

How do you figure from cost to markdown

It is not clear what type of calculation you are attempting. Some financial calculations are described in the manual. If you do not have the manual handy, then you may want to refer to the online manual for JF-120BM (which is very similar in operation) at the following link: http://www.servicecasio.com/web/download/manual/DF-120BM_DM-1200BM_JF-120BM_FA_DI8S.pdf See the right column of page 2 of this manual.

ASIN	B003827RSA
Batteries	1 LR44 batteries required.
Best Sellers Rank	#6,285 in Office Products ( See Top 100 in Office Products ) #26 in Basic Calculators
Brand	Casio
Color	Multicolor
Customer Reviews	4.6 4.6 out of 5 stars (821)
Date First Available	1 January 2024
Item Weight	155 g
Lines Per Page	1
Manufacturer	CASIO
Manufacturer Part Number	JF-100MS
Material Type	Plastic
Model number	JF-100BM
Number of Items	1
Product Dimensions	17.78 x 10.16 x 2.54 cm; 155 g
Shape	L Shaped
Size	4 1/4 x 6 7/8

Casio Inc. JF-100BM Standard Function Calculator,Multicolor

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