Solution :
The function code is :
function newPriceTable = UpdatePriceTable(origPriceTable,changePrice, colNum)
newPriceTable = origPriceTable:
newpriceTable(:,colNum) = newPriceTable(:,colNum)+changePrice;
end
UpdatePriceTable ([19.99, 9.99; 14.99, 8.99;], [-1.00, -1.50] , 1)
ans = 18.9900 Â Â Â 9.9900
     13.4900    8.9900