How many for how much

Facilitation buying goods that are specified just the base price.
Imagine that you come to the shop and want to buy potato salad for dinner. You come to the counter with salads and in your favorite salad is specified base price 0.40 ($,€,£...) for 100 grams of salad. Two problems might arise.
1.How much money do you pay for your favorite amount, let us say, 25 dg of salad?
2.How much of salad you ask the shop assistant if you want to fit in your last, say, 1.25 ($,€,£...)?
The application How many for how much easily solves all these problems.
In case of problem 1.: Into the text box "Basic weight" enter 100, and select the check box "g". Into the text box "Basic price" enter 0.40. Into the text box "Desired weight" enter 25 and select the check box "dg". In the text box "Final price" will appear the amount of money that you pay for the 25dg of salad or other goods.
In case of problem 2.: Do exactly the same as in the first problem with the difference that in the text. field "Desired weight" not specify one, but in text. field "Desired Price" enter 1.25. In the text. the "final weight" will appear the weight of salad, that you will ask shop assistants.
We wish you a good taste to a favorite salad or maybe salami… :-)