a calculator with 4 functions!!!
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It depends on the type of HP calculator you are using. You may only use a four-function, scientific, and graph calculator that does not come with other functions.
You need a scientific calculator, or one with function keys.
Google can function as a calculator also, but the answer is 690.
That function depends on the calculator's capabilites. Some calculators do not show fractions. They only represent fractions as a decimal value (e.g. 50% is represented in the calculator as .5). If your calculator has a fraction function, you can enter 50% then press the fraction button & it will display 1/2 (which is the lowest fraction for 50%).
to help do calculations quicker than the human mind for our ease.