SYDNEY : Australia will spend A$4 billion over the next year to pay businesses that hire those under the age of 35, Treasurer Josh Frydenberg said on Tuesday, as part of an ambitious plan to boost jobs and growth.Australia has been widely lauded for limiting the spread of COVID-19, but strict lockdown measures forced shut entire sectors of the economy, sending unemployment to a 22-year high of 7.5% in July.The impact on younger Australians is even worse, with recent data showing the unemployment rate for 15- to 24-year olds was hovering near 20%.As part of the government's hiring credit scheme, Canberra will pay businesses A$200 a week for the next a year if they employ a person under 29.Businesses will get A$100 per week if they employ a.