<span>In her holocaust memorial, Rachel Whiteread depicted the shapes of identical books as a (reference to the Jews as "the people of the book".)</span>
Here is the formula to calculate GDP:
GDP<span> = C + G + I + NX
</span>Where I is the investment that include all form of capital expenditure
Both sales mentioned above could be considered as a form of Capital expenditure, so the total contribution to GRP would be:
$30 + $ 15 = $ 45
