Function calcUnits

calcUnits(totalPrice, unitPrice, priceDecimals?, unitDecimals?): bigint
Calculates units based on the total price and number of units.
Parameters
- totalPrice: string | bigint
- unitPrice: string | bigint
- Optional priceDecimals: number
- Optional unitDecimals: number
Returns bigint
Example
```
calcUnits(BigInt(1e5), BigInt(2e6)) // 50000000000000000n
calcUnits('1000', '1200', 2, 2) // 83n === 0.83 * 10^2
```