Correct option is B. $$2.5\%$$
Because ,
Assume $$x$$ be the percent of $$1$$ day is $$36$$ minutes
We know that, $$1$$ day $$=24$$ hour
$$=60\times 24$$
$$=1440$$ minutes
Now,
$$=(x\% \ of\ 1440)=36$$
$$=(x/100)\times 1440=36$$
$$=x=(36\times 100)/1440$$
$$=x=2.5\%$$