Produce the following examples

example 1

example 2

example 3

devolop the following

1. sales receipt calculater

2. invoice calculater

3. sales calculater

Sales Receipt SubTotal Sales Tax Total Exit Invoice Item Price ADD \begin{tabular}{llc} \hline PRODUCT & PRICE & \\ Yam & & GHc23.00 \\ Wine & & GHe30.00 \\ Soap & & GHe5.00 \\ Powder & GHe10.00 \end{tabular} Sub Total GHe 68.00 Sales Tax(6.5\%) GHe 4.42 Total GHe 72.42 Button 3 Form2 &3 Product Quatity Unit Price ADD Sub Total GHe265.00 Sales Tax(6.5%)GHe17.23 Total GHe 282.23