Question 1055137
If it used to cost 100 whatevers to buy 100 packs,
at 1 whatever per pack, as the price increases by 25%,
to 1.25 per pack, the same 100 whatevers coffee budget will buy just
{{{100/1.25=80}}} packs, a decrease of
{{{(100-80)/100=20/100="20%"}}}
in the coffee amount you can buy.