Answer:
re order is 90 bottles
Step-by-step explanation:
given data
shampoo in stock = 50 bottles
reserve = 35
stock record = 4 week
delivery = 3 week
average sale = 15 / week
to find out
what should be re ordered
solution
according to question we know that total week for order is
total week for order = 4 + 3 = 7 week
so total sale in 7 week is = 7 × average sale
total sale in 7 week = 7 × 15 = 105 bottles
and
he need more bottle = total sale - in stock
need bottle = 105 - 50
need bottle = 55
so order = need bottle + reserved bottle
order = 55 + 35
order = 90 bottles
so re order is 90 bottles