ExamGrade | Topcoder Archive

Problem Statement

You are preparing for the final exam in an online course, and you want to know score you need to get on it to get a passing grade for the course. The grade for the course is calculated as (percentage of score you got for in-lecture questions) * (weight of in-lecture questions) + (percentage of score you got for final exam) * (weight of final exam).
lectureGrade is the percentage of max score you got for in-lecture questions.
lectureWeight is the weight of in-lecture questions in the course grade. The weight of the final exam is 100-lectureWeight.
passingGrade is the minimal grade you need to get to pass the course, in percent.
Your score on the final exam will be an integer between 0 and 100, inclusive. Return the score you need to get to pass the course, or -1 if it is impossible for you to pass the course.

Definition

Class:: ExamGrade
Method:: minToPass
Parameters:: int, int, int
Returns:: int
Method signature:: int minToPass(int lectureGrade, int lectureWeight, int passingGrade)
(be sure your method is public)

Constraints

lectureGrade will be between 0 and 100, inclusive.
lectureWeight will be between 0 and 100, inclusive.
passingGrade will be between 0 and 100, inclusive.

Examples

```
70
```
```
50
```
```
70
```
```
Returns: 70
```
Your grade on lecture is a passing grade, so the exam grade also needs to be at least that same passing grade.
```
50
```
```
50
```
```
70
```
```
Returns: 90
```
Lecture and exam grades have equal weight overall, so 50% and 90% would average out to be 70%.
```
0
```
```
50
```
```
70
```
```
Returns: -1
```
You didn't even bother showing up to class... with a lecture grade so low, there's no hope of passing.

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