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Add 부족한-금액-계산하기.js

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Original file line number	Diff line number	Diff line change
`@@ -36,4 +36,14 @@ function solution(price, money, count) {`
`36`	`36`	`return 0;`
`37`	`37`	`}`
`38`	`38`	`return sum_price - money;`
	`39`	`+}`
	`40`	`+`
	`41`	`+//정답 3 - prove-ability`
	`42`	`+function solution(price, money, count) {`
	`43`	`+ let sum = 0;`
	`44`	`+ for(let i = 1; i <= count; i++) {`
	`45`	`+ sum += (i * price)`
	`46`	`+ }`
	`47`	`+`
	`48`	`+ return sum < money ? 0 : sum - money;`
`39`	`49`	`}`

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