A laundromat hired a delivery service to move its machines to a new location. The mass of all its inventory 31680 kg. The load and rental cost of a lorry from the delivery service are seen in the table.

Delivery service package
Load to be carried per lorry	Mass not over 4000 kg
Rental cost of 1 lorry with driver	$90 per hour or part thereof

The laundromat hired the delivery service from 3 p.m. to 4.10 p.m. Find the total amount that was paid for the delivery service.
Number of sets of 4000 kg
= 31680 ÷ 4000
= 7.92

Number of lorries needed to transport 31680 kg of inventory
= 7 + 1
= 8

From 3 p.m. to 4.10 p.m.: 1 h 10 min

Duration that each lorry would be rented for 
= 1 + 1
= 2 h

Rental cost of 1 lorry with driver for 2 h
= 2 x 90
= $180

Rental cost of 8 lorries with drivers for 2 h
= 8 x 180
= $1440

Answer(s): $1440