Question

the marks in a test decreased from 40 to 30 the percentage decrease equal.​

Answer 1

$25 \: \: \: \: \: percent$

$40's \: 25 \: \: part \: \: is \: \: 10$

$40-10=30$

Answer 2

Answer:

original price=40

decreased to=30

decreased price=40-30=10

% is= 10/40×100 =25%