Multiply each object attribute and display the sum of all

I have a object list [{product:banana, price: 10, quantity: 2}, {product:potato, price: 5, quantity: 2}]
I wan to so multiply the price by the quantity and then sum all values to have a total. seems pretty simple but require a combination of formulas that I dont know.

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for anyone wondering the best solution is using custom javascript module
a print of the exact funcion that solved this problem for me.

Montei um exemplo de como consegui, dá uma olhada aí…