I’ll make you brainliest

suppose yogurt is on sale for $0.50 a piece, and you have a coupon for $0.30 off your total purchase. write a function rule for the coast of n yogurts. how much would 20 yogurts cost?

a: c(n)=0.50n-0.3; $9.70
b: c(n)=0.30n-0.5; $5.50
c: c(n)=0.2n; $4.00
d: c(n)=035n; $10.00