·         US$1500 (revenue) / US$1200 (cost + Google Ads spend)
·         [US$1500 (revenue) – 10 (number of products sold)] / US$1200 (cost + Google Ads spend)
·         [US$150 (sales price) – US$1500 (cost)] / US$700 (Google Ads spend)
·         [US$1500 (revenue) – US$1200 (cost + Google Ads spend)] / US$1200 (cost + Google Ads spend)

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