Doha: Oil prices rose 1 percent on Monday as upbeat manufacturing data from China led to renewed optimism for fuel demand, although uncertainty about global economic growth from potential US tariffs loomed. Brent crude climbed 76 cents, or 1 percent, to $73.57 a barrel while US West Texas Intermediate crude was at $70.51 a barrel, up 75 cents, or 1.1 percent. According to Qatar News Agency, last month, Brent and WTI posted their first monthly decline in three months as the threat of tariffs from the US and its trade partners shook investors' confidence in global economic growth this year and reduced their appetite for riskier assets.