If the discount is 27%, then what percentage of the original price do you pay? Please give an explanation as well if you can! Thank you in advance. Whoever answers correctly will get Brainliest. Stay happy and have a blessed rest of your day. :)

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b