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@@ -0,0 +1,32 @@
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+package main
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+
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+import (
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+ "os"
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+ "fmt"
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+)
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+
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+func accountBalanceAfterPurchase(purchaseAmount int) int {
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+ var firstDigit int = purchaseAmount % 10
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+ if firstDigit >= 5 {
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+ return 100 - (purchaseAmount + (10 - firstDigit))
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+ }
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+
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+ return 100 - (purchaseAmount - firstDigit)
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+}
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+
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+func main() {
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+ r := func(purchaseAmount int, exp int) {
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+ fmt.Printf(
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+ "accountBalanceAfterPurchase(%v) = %v | exp: %v\n",
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+ purchaseAmount,
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+ accountBalanceAfterPurchase(purchaseAmount),
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+ exp,
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+ )
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+ }
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+
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+ r(9, 90)
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+ r(15, 80)
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+ r(10, 90)
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+
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+ os.Exit(0)
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+}
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