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By the way, there i found video for this app on Android Market https://market.android.com/details?id=com.suisolutions.imargin&feature=search_result&hl=en

i recently have found program that quickly calculate margin on my htc (windows phone 7) with variable tax. But i do not sure is this right app. So, i place 50% margin and cost 3000$. Variable tax is 6,5 under 5000 and 6% over 5000. But it give me results sell: 6385 %. is this right...

Hello, is there users of windows phone7 ? Please suggest me soft to easy and fast calculating markup/profit/margin while dealing (i am frequently make bargain on trade show)? TIA