1. Blake is deciding whether to go swimming or study after class.He goes swimming frequently and has bought a non-refundable swimming pool annual ticket costing $277.If he spent the time studying after class, he would be able to enrich his knowledge and be confident in any assessments, which would bring him pleasantness worth $363.If Blake decides to go swimming rather than studying, his opportunity cost of going to swim is[Answer]dollars.

(In decimal numbers, with two decimal places, please.)