The problem is to create a function roundSum which takes three integers as input and returns their sum. However, before adding, each number should be rounded to the nearest multiple of

$10.$

$$If the last digit of the number is

$5$

$$or more, round up to the next multiple of

$10.$

$$If it

$$

s less than

$5$

$,$

$$round down to the previous multiple of

$10.$

The roundSum function should accept three parameters:

a: an integer value.

b: an integer value.

c: an integer value.

Additionally, to avoid repetition, write a helper function round

$10$

$$which will perform the rounding operation.

Here are some examples:

roundSum

$($

$16$

$,$

$17$

$,$

$18$

$)$

$$should return

$60$ using java script