Reckon you can answer this uber hard maths question

A music store offers a prize to a customer who can guess the closest, the number of jelly beans that fill a litre jar on the counter. Estimate the number of jelly beans in the jar if 1 jelly bean is approximately 2cm long (h) by 1.5cm in diameter (d).

Show your working.
p.s. (1 liter is 1000cm cubed )

volume of a jelly bean=pi*1.5^2*2/4 cm^3=3.53
so number of jelly beans in the jar
= 1000/3.53 =282.94 ie 282

I got 282.94 jelly beans...so I guess you'd have to round down to 282 to be pedantic.