Probably more like $15 to $20 billion over that span (accounting for inflation, cost bloat, unexpected b.s. etc).
Still worth it. I'm hoping our technology for traveling the solar system, and the robotic systems to explore it, will get cheaper and cheaper on a cost per unit of result basis (meaning the nominal cost will rise as expected, but the value we receive from our technology will rise much faster).
Still worth it. I'm hoping our technology for traveling the solar system, and the robotic systems to explore it, will get cheaper and cheaper on a cost per unit of result basis (meaning the nominal cost will rise as expected, but the value we receive from our technology will rise much faster).