A shopkeeper orders packets of soap powder. The cost price of a large packet is
N180 and that of a small packet is N80. She
is prepared to spend up to N4000 altogether
and needs twice as many large packets as
small packets with a minimum of 10 large
and 20 small packets.
a What is the greatest number of packets
she can buy?
The profit is N20 on a large packet and N10
on a small packet.
b Which arrangement gives the greatest
profit?
c What is that profit?​