Alecto (Pilot Paper)

Dear sir,
While using futures options in this qn, it says the exercise price is 4% and June futures rate as 3.98%, when the interest rate increases by 0.5%

The answer to the qn should the option being exercise according to the revision kit says no,

I worked out the gain to be
(4%-3.98%)* 22mn*5/12 = 0.001833 mn

My doubt is is this gain too negligible to even consider exercising this option? Or am I making a big deal about this?

Thanks