account-balance-after-rounded-purchase

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Algorithms

Initially, you have a bank account balance of 100 dollars.

You are given an integer <code>purchaseAmount</code> representing the amount you will spend on a purchase in dollars, in other words, its price.

When making the purchase, first the <code>purchaseAmount</code> is rounded to the nearest multiple of 10. Let us call this value <code>roundedAmount</code>. Then, <code>roundedAmount</code> dollars are removed from your bank account.

Return an integer denoting your final bank account balance after this purchase.

Notes:

<ul>
	<li>0 is considered to be a multiple of 10 in this problem.</li>
	<li>When rounding, 5 is rounded upward (5 is rounded to 10, 15 is rounded to 20, 25 to 30, and so on).</li>
</ul>

&nbsp;
Example 1:

<div class="example-block">
Input: purchaseAmount = 9

Output: 90

Explanation:

The nearest multiple of 10 to 9 is 10. So your account balance becomes 100 - 10 = 90.
</div>

Example 2:

<div class="example-block">
Input: purchaseAmount = 15

Output: 80

Explanation:

The nearest multiple of 10 to 15 is 20. So your account balance becomes 100 - 20 = 80.
</div>

Example 3:

<div class="example-block">
Input: purchaseAmount = 10

Output: 90

Explanation:

10 is a multiple of 10 itself. So your account balance becomes 100 - 10 = 90.
</div>

&nbsp;
Constraints:

<ul>
	<li><code>0 &lt;= purchaseAmount &lt;= 100</code></li>
</ul>

accountBalanceAfterPurchase

Account Balance After Rounded Purchase

Math

一开始，你的银行账户里有&nbsp;<code>100</code>&nbsp;块钱。

给你一个整数<code>purchaseAmount</code>&nbsp;，它表示你在一次购买中愿意支出的金额。

在一个商店里，你进行一次购买，实际支出的金额会向 最近&nbsp;的&nbsp;<code>10</code>&nbsp;的 倍数&nbsp;取整。换句话说，你实际会支付一个&nbsp;非负&nbsp;金额&nbsp;<code>roundedAmount</code>&nbsp;，满足&nbsp;<code>roundedAmount</code>&nbsp;是&nbsp;<code>10</code>&nbsp;的倍数且&nbsp;<code>abs(roundedAmount - purchaseAmount)</code>&nbsp;的值 最小&nbsp;。

如果存在多于一个最接近的 <code>10</code>&nbsp;的倍数，较大的倍数&nbsp;是你的实际支出金额。

请你返回一个整数，表示你在愿意支出金额为&nbsp;<code>purchaseAmount</code>&nbsp;块钱的前提下，购买之后剩下的余额。

注意： <code>0</code>&nbsp;也是&nbsp;<code>10</code>&nbsp;的倍数。

&nbsp;

示例 1：

<pre>输入：purchaseAmount = 9
输出：90
解释：这个例子中，最接近 9 的 10 的倍数是 10 。所以你的账户余额为 100 - 10 = 90 。
</pre>

示例 2：

<pre>输入：purchaseAmount = 15
输出：80
解释：这个例子中，有 2 个最接近 15 的 10 的倍数：10 和 20，较大的数 20 是你的实际开销。
所以你的账户余额为 100 - 20 = 80 。
</pre>

&nbsp;

提示：

<ul>
	<li><code>0 &lt;= purchaseAmount &lt;= 100</code></li>
</ul>