[Solution] Bob at the Bank CodeChef Solution

Problem

Bob has an account in the Bobby Bank. His current account balance is $W$ rupees.

Each month, the office in which Bob works deposits a fixed amount of $X$ rupees to his account.
$Y$ rupees is deducted from Bob's account each month as bank charges.

Find his final account balance after $Z$ months. Note that the account balance can be negative as well. 

Input Format

• The first line will contain $T$, the number of test cases. Then the test cases follow.
• Each test case consists of a single line of input, containing four integers $W,X,Y,$ and $Z$ — the initial amount, the amount deposited per month, the amount deducted per month, and the number of months.

Output Format

For each test case, output in a single line the final balance in Bob's account after $Z$ months.

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Explanation:

Test case $1$: Bob's current account balance is $100$. At the end of each month Bob gets Rs $11$ and pays Rs $1$, thus gaining $10$ per month. Thus, at the end of $10$ months, Bob will have $100 + 10 \times 10 = 200$.

Test case $2$: Bob's current account balance is $999$. At the end of each month Bob gets Rs $25$ and pays Rs $36$, thus losing $11$ per month. Thus, at the end of $9$ months, Bob will have $999 - 11 \times 9 = 900$.

Test case $3$: Bob's current account balance is $2500$. At the end of each month Bob gets Rs $100$ and pays Rs $125$, thus losing $25$ per month. Thus, at the end of $101$ months, Bob will have $2500 - 25 \times 101 = -25$.