Construct a solution algorithm for the following problems. Your solution should contain:

A defining problem

A pseudo code algorithm

A desk check of the algorithm

Three test cases for each question. Two valid and one error test case

Question $1$

The Delivery Service Provider provides the parcel delivery service within Singapore. The delivery charge is calculated based on the Box size and parcel weight shown below in the table,

$\backslash$table$[[$Box Size,Weight,Delivery Charge$],[$Small$,$Less than $3kg,$$$8\mathrm{.}00$