The functions all work as they are supposed to, however I would like the grand total to update after every tab or click outside of the inputs.

JSX:

<div className="w-full px-2 md:w-1/6">
   <input type="text" placeholder="0.00" id="unit_price" onBlur={(e) => handlePriceChange(e)}/>
</div>

<div className="w-full px-2 md:w-1/6">
    <input type="text" id="qty" onBlur={(e) => handleQtyChange(e)} />
</div>

Here are the handler functions:

const handleQtyChange = (e: any) => {
        let parsedQty: number = parseFloat(e.target.value);
        if(Number.isNaN(parsedQty)){
            console.log("yes")
            parsedQty = 0;
        }
        let final = parsedQty * price;
        setQty(parsedQty);
        setTotal(final);
        lineTotal(final, count) //this fires the addLineTotal() function in the parent component
    }

    const handlePriceChange = (e: any): void => {
        let parsedPrice: number = parseFloat(e.target.value);
        if(Number.isNaN(parsedPrice)){
            console.log("yes")
            parsedPrice = 0;
        }
        let final = parsedPrice * qty;
        setPrice(parsedPrice);
        setTotal(final);
        lineTotal(final, count) //this fires the addLineTotal() function in the parent component
    }

Finally, here are the parent component callback functions to calculate line totals and then grand total.

const addLineTotal = (num: number, lineID: number): void => {
        //calculates line total and executes grant total function
        console.log("num => ", num);
        let newTotal: number[] = [...total];
        console.log("New total => ", newTotal)
        newTotal[lineID] = num;
        setTotal(newTotal);
        calculateGrandTotal();
    }

    const calculateGrandTotal = () => {
        //reduces the total array to single value
        const reducer = (a: number, b: number) => a + b; 
        let gt: number = total.reduce(reducer);
        console.log("GT => ", gt, "type of gt => ", typeof gt);
        setGrandTotal(gt);
    }

All numbers are calculating correctly, but I need to go back into the line then out for the grand total to calculate.