The price of limes is 6 for $1.90. rashid expects to pay 95¢ for 4 limes.

is that amount reasonable?

a.
yes, because half of $1.90 is about $1.00.

b.
yes, because each lime will cost a bit less than 30¢, so 4 limes will cost a bit less than $1.20.

c.
no, because each lime will cost a bit more than 30¢, so 4 limes will cost a bit more than $1.20.