The members at a health club decreased in number by 15% from last year to this year. the following expression was used to find the number of members in the health club this year, t, where h is the number of members in the health club last year.

select the correct interpretation for the given equation.
a.
h is 0.85% of the number of members last year.
b.
h is 0.15% of the number of members last year.
c.
h is 15% of the number of members last year.
d.
h is 85% of the number of members last year.