Katie is selling lemonade for $1.50 per cup. she decides to put them on sale for $0.90. what percent discount did she give on her lemonade?

What is the sum of the geometric series in which a1 = 7, r = 3, and an = 1,701? hint: cap s sub n equals start fraction a sub one left parenthesis one minus r to the power of n end power right parenthesis over one minus r end fraction comma r ≠ 1, where a1 is the first term and r is the common ratio