Agree with the above. If BU is unaffordable for four years, don’t go. And to me it looks like WPI is also unaffordable unless your package changes substantially upon review.
You need to understand that: 1) most people’s college decisions are based on affordability and 2) colleges are not obligated to provide enough funding to allow each accepted applicant to attend. It is up to the applicant to research affordable options, to run net price calculators to get an estimate of aid from colleges he/she applies to, to seek out schools where he/she might qualify for merit aid if that is needed etc. If you have no affordable options, look at the suggestions noted above by posters above.